chore(deps): update dependency urllib3 to v2.7.0 [security] by renovate[bot] · Pull Request #5490 · open-telemetry/opentelemetry-python

renovate · 2026-07-30T16:58:55Z

ℹ️ Note

This PR body was truncated due to platform limits.

This PR contains the following updates:

Package	Change	Age	Confidence
urllib3 (changelog)	`==2.2.2` → `==2.7.0`
urllib3 (changelog)	`==1.26.19` → `==2.7.0`

urllib3 redirects are not disabled when retries are disabled on PoolManager instantiation

CVE-2025-50181 / GHSA-pq67-6m6q-mj2v

More information

Details

urllib3 handles redirects and retries using the same mechanism, which is controlled by the Retry object. The most common way to disable redirects is at the request level, as follows:

resp = urllib3.request("GET", "https://httpbin.org/redirect/1", redirect=False)
print(resp.status)

##### 302

However, it is also possible to disable redirects, for all requests, by instantiating a PoolManager and specifying retries in a way that disable redirects:

import urllib3

http = urllib3.PoolManager(retries=0)  # should raise MaxRetryError on redirect
http = urllib3.PoolManager(retries=urllib3.Retry(redirect=0))  # equivalent to the above
http = urllib3.PoolManager(retries=False)  # should return the first response

resp = http.request("GET", "https://httpbin.org/redirect/1")

However, the retries parameter is currently ignored, which means all the above examples don't disable redirects.

Affected usages

Passing retries on PoolManager instantiation to disable redirects or restrict their number.

By default, requests and botocore users are not affected.

Impact

Redirects are often used to exploit SSRF vulnerabilities. An application attempting to mitigate SSRF or open redirect vulnerabilities by disabling redirects at the PoolManager level will remain vulnerable.

Remediation

You can remediate this vulnerability with the following steps:

Upgrade to a patched version of urllib3. If your organization would benefit from the continued support of urllib3 1.x, please contact sethmichaellarson@gmail.com to discuss sponsorship or contribution opportunities.
Disable redirects at the request() level instead of the PoolManager() level.

Severity

CVSS Score: 5.3 / 10 (Medium)
Vector String: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

urllib3 does not control redirects in browsers and Node.js

CVE-2025-50182 / GHSA-48p4-8xcf-vxj5

More information

Details

urllib3 supports being used in a Pyodide runtime utilizing the JavaScript Fetch API or falling back on XMLHttpRequest. This means you can use Python libraries to make HTTP requests from your browser or Node.js. Additionally, urllib3 provides a mechanism to control redirects.

However, the retries and redirect parameters are ignored with Pyodide; the runtime itself determines redirect behavior.

Affected usages

Any code which relies on urllib3 to control the number of redirects for an HTTP request in a Pyodide runtime.

Impact

Redirects are often used to exploit SSRF vulnerabilities. An application attempting to mitigate SSRF or open redirect vulnerabilities by disabling redirects may remain vulnerable if a Pyodide runtime redirect mechanism is unsuitable.

Remediation

If you use urllib3 in Node.js, upgrade to a patched version of urllib3.

Unfortunately, browsers provide no suitable way which urllib3 can use: XMLHttpRequest provides no control over redirects, the Fetch API returns opaqueredirect responses lacking data when redirects are controlled manually. Expect default browser behavior for redirects.

Severity

CVSS Score: 5.3 / 10 (Medium)
Vector String: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

urllib3 allows an unbounded number of links in the decompression chain

CVE-2025-66418 / GHSA-gm62-xv2j-4w53

More information

Details

Impact

urllib3 supports chained HTTP encoding algorithms for response content according to RFC 9110 (e.g., Content-Encoding: gzip, zstd).

However, the number of links in the decompression chain was unbounded allowing a malicious server to insert a virtually unlimited number of compression steps leading to high CPU usage and massive memory allocation for the decompressed data.

Affected usages

Applications and libraries using urllib3 version 2.5.0 and earlier for HTTP requests to untrusted sources unless they disable content decoding explicitly.

Remediation

Upgrade to at least urllib3 v2.6.0 in which the library limits the number of links to 5.

If upgrading is not immediately possible, use preload_content=False and ensure that resp.headers["content-encoding"] contains a safe number of encodings before reading the response content.

Severity

CVSS Score: 8.9 / 10 (High)
Vector String: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

urllib3 streaming API improperly handles highly compressed data

CVE-2025-66471 / GHSA-2xpw-w6gg-jr37

More information

Details

Impact

urllib3's streaming API is designed for the efficient handling of large HTTP responses by reading the content in chunks, rather than loading the entire response body into memory at once.

When streaming a compressed response, urllib3 can perform decoding or decompression based on the HTTP Content-Encoding header (e.g., gzip, deflate, br, or zstd). The library must read compressed data from the network and decompress it until the requested chunk size is met. Any resulting decompressed data that exceeds the requested amount is held in an internal buffer for the next read operation.

The decompression logic could cause urllib3 to fully decode a small amount of highly compressed data in a single operation. This can result in excessive resource consumption (high CPU usage and massive memory allocation for the decompressed data; CWE-409) on the client side, even if the application only requested a small chunk of data.

Affected usages

Applications and libraries using urllib3 version 2.5.0 and earlier to stream large compressed responses or content from untrusted sources.

stream(), read(amt=256), read1(amt=256), read_chunked(amt=256), readinto(b) are examples of urllib3.HTTPResponse method calls using the affected logic unless decoding is disabled explicitly.

Remediation

Upgrade to at least urllib3 v2.6.0 in which the library avoids decompressing data that exceeds the requested amount.

If your environment contains a package facilitating the Brotli encoding, upgrade to at least Brotli 1.2.0 or brotlicffi 1.2.0.0 too. These versions are enforced by the urllib3[brotli] extra in the patched versions of urllib3.

Credits

The issue was reported by @Cycloctane.
Supplemental information was provided by @stamparm during a security audit performed by 7ASecurity and facilitated by OSTIF.

Severity

CVSS Score: 8.9 / 10 (High)
Vector String: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

Decompression-bomb safeguards bypassed when following HTTP redirects (streaming API)

CVE-2026-21441 / GHSA-38jv-5279-wg99

More information

Details

Impact

urllib3's streaming API is designed for the efficient handling of large HTTP responses by reading the content in chunks, rather than loading the entire response body into memory at once.

urllib3 can perform decoding or decompression based on the HTTP Content-Encoding header (e.g., gzip, deflate, br, or zstd). When using the streaming API, the library decompresses only the necessary bytes, enabling partial content consumption.

However, for HTTP redirect responses, the library would read the entire response body to drain the connection and decompress the content unnecessarily. This decompression occurred even before any read methods were called, and configured read limits did not restrict the amount of decompressed data. As a result, there was no safeguard against decompression bombs. A malicious server could exploit this to trigger excessive resource consumption on the client (high CPU usage and large memory allocations for decompressed data; CWE-409).

Affected usages

Applications and libraries using urllib3 version 2.6.2 and earlier to stream content from untrusted sources by setting preload_content=False when they do not disable redirects.

Remediation

Upgrade to at least urllib3 v2.6.3 in which the library does not decode content of redirect responses when preload_content=False.

If upgrading is not immediately possible, disable redirects by setting redirect=False for requests to untrusted source.

Severity

CVSS Score: 8.9 / 10 (High)
Vector String: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

urllib3: Sensitive headers forwarded across origins in proxied low-level redirects

CVE-2026-44431 / GHSA-qccp-gfcp-xxvc

More information

Details

Impact

When following cross-origin redirects for requests made using urllib3’s high-level APIs, such as urllib3.request(), PoolManager.request(), and ProxyManager.request(), sensitive headers — Authorization, Cookie, and Proxy-Authorization (defined in Retry.DEFAULT_REMOVE_HEADERS_ON_REDIRECT) — are stripped by default, as expected.

However, cross-origin redirects followed from the low-level API via ProxyManager.connection_from_url().urlopen(..., assert_same_host=False) still forward these sensitive headers.

Affected usage

Applications and libraries using urllib3 versions earlier than 2.7.0 may be affected if they allow cross-origin redirects while making requests through HTTPConnection.urlopen() instances created via ProxyManager.connection_from_url().

Remediation

Upgrade to urllib3 version 2.7.0 or later, in which sensitive headers are stripped from redirects followed by HTTPConnection.

If upgrading is not immediately possible, avoid using this low-level redirect flow for cross-origin redirects. If appropriate for your use case, switch to ProxyManager.request().

Severity

CVSS Score: 8.2 / 10 (High)
Vector String: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

Exposure of Sensitive Information to an Unauthorized Actor in urllib3

CVE-2018-20060 / GHSA-www2-v7xj-xrc6

More information

Details

urllib3 before version 1.23 does not remove the Authorization HTTP header when following a cross-origin redirect (i.e., a redirect that differs in host, port, or scheme). This can allow for credentials in the Authorization header to be exposed to unintended hosts or transmitted in cleartext.

Severity

CVSS Score: 9.3 / 10 (Critical)
Vector String: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

Improper Certificate Validation in urllib3

CVE-2019-11324 / GHSA-mh33-7rrq-662w

More information

Details

The urllib3 library before 1.24.2 for Python mishandles certain cases where the desired set of CA certificates is different from the OS store of CA certificates, which results in SSL connections succeeding in situations where a verification failure is the correct outcome. This is related to use of the ssl_context, ca_certs, or ca_certs_dir argument.

Severity

CVSS Score: 8.7 / 10 (High)
Vector String: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

CRLF injection in urllib3

CVE-2020-26137 / GHSA-wqvq-5m8c-6g24

More information

Details

urllib3 before 1.25.9 allows CRLF injection if the attacker controls the HTTP request method, as demonstrated by inserting CR and LF control characters in the first argument of putrequest(). NOTE: this is similar to CVE-2020-26116.

Severity

CVSS Score: 6.9 / 10 (Medium)
Vector String: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

Improper Neutralization of CRLF Sequences in urllib3 library for Python

CVE-2019-11236 / GHSA-r64q-w8jr-g9qp

More information

Details

In the urllib3 library through 1.24.2 for Python, CRLF injection is possible if the attacker controls the request parameter.

Severity

CVSS Score: 5.3 / 10 (Medium)
Vector String: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

`Cookie` HTTP header isn't stripped on cross-origin redirects

CVE-2023-43804 / GHSA-v845-jxx5-vc9f

More information

Details

urllib3 doesn't treat the Cookie HTTP header special or provide any helpers for managing cookies over HTTP, that is the responsibility of the user. However, it is possible for a user to specify a Cookie header and unknowingly leak information via HTTP redirects to a different origin if that user doesn't disable redirects explicitly.

Users must handle redirects themselves instead of relying on urllib3's automatic redirects to achieve safe processing of the Cookie header, thus we decided to strip the header by default in order to further protect users who aren't using the correct approach.

Affected usages

We believe the number of usages affected by this advisory is low. It requires all of the following to be true to be exploited:

Using an affected version of urllib3 (patched in v1.26.17 and v2.0.6)
Using the Cookie header on requests, which is mostly typical for impersonating a browser.
Not disabling HTTP redirects
Either not using HTTPS or for the origin server to redirect to a malicious origin.

Remediation

Upgrading to at least urllib3 v1.26.17 or v2.0.6
Disabling HTTP redirects using redirects=False when sending requests.
Not using the Cookie header.

Severity

CVSS Score: 7.4 / 10 (High)
Vector String: CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

Authorization Header forwarded on redirect

CVE-2018-25091 / GHSA-gwvm-45gx-3cf8

More information

Details

urllib3 before 1.24.2 does not remove the authorization HTTP header when following a cross-origin redirect (i.e., a redirect that differs in host, port, or scheme). This can allow for credentials in the authorization header to be exposed to unintended hosts or transmitted in cleartext. NOTE: this issue exists because of an incomplete fix for CVE-2018-20060 (which was case-sensitive).

Severity

CVSS Score: 5.3 / 10 (Medium)
Vector String: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

urllib3's request body not stripped after redirect from 303 status changes request method to GET

CVE-2023-45803 / GHSA-g4mx-q9vg-27p4

More information

Details

urllib3 previously wouldn't remove the HTTP request body when an HTTP redirect response using status 303 "See Other" after the request had its method changed from one that could accept a request body (like POST) to GET as is required by HTTP RFCs. Although the behavior of removing the request body is not specified in the section for redirects, it can be inferred by piecing together information from different sections and we have observed the behavior in other major HTTP client implementations like curl and web browsers.

From RFC 9110 Section 9.3.1:

A client SHOULD NOT generate content in a GET request unless it is made directly to an origin server that has previously indicated, in or out of band, that such a request has a purpose and will be adequately supported.

Affected usages

Because the vulnerability requires a previously trusted service to become compromised in order to have an impact on confidentiality we believe the exploitability of this vulnerability is low. Additionally, many users aren't putting sensitive data in HTTP request bodies, if this is the case then this vulnerability isn't exploitable.

Both of the following conditions must be true to be affected by this vulnerability:

If you're using urllib3 and submitting sensitive information in the HTTP request body (such as form data or JSON)
The origin service is compromised and starts redirecting using 303 to a malicious peer or the redirected-to service becomes compromised.

Remediation

You can remediate this vulnerability with any of the following steps:

Upgrade to a patched version of urllib3 (v1.26.18 or v2.0.7)
Disable redirects for services that you aren't expecting to respond with redirects with redirects=False.
Disable automatic redirects with redirects=False and handle 303 redirects manually by stripping the HTTP request body.

Severity

CVSS Score: 5.7 / 10 (Medium)
Vector String: CVSS:4.0/AV:A/AC:L/AT:P/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

urllib3's Proxy-Authorization request header isn't stripped during cross-origin redirects

CVE-2024-37891 / GHSA-34jh-p97f-mpxf

More information

Details

When using urllib3's proxy support with ProxyManager, the Proxy-Authorization header is only sent to the configured proxy, as expected.

However, when sending HTTP requests without using urllib3's proxy support, it's possible to accidentally configure the Proxy-Authorization header even though it won't have any effect as the request is not using a forwarding proxy or a tunneling proxy. In those cases, urllib3 doesn't treat the Proxy-Authorization HTTP header as one carrying authentication material and thus doesn't strip the header on cross-origin redirects.

Because this is a highly unlikely scenario, we believe the severity of this vulnerability is low for almost all users. Out of an abundance of caution urllib3 will automatically strip the Proxy-Authorization header during cross-origin redirects to avoid the small chance that users are doing this on accident.

Users should use urllib3's proxy support or disable automatic redirects to achieve safe processing of the Proxy-Authorization header, but we still decided to strip the header by default in order to further protect users who aren't using the correct approach.

Affected usages

We believe the number of usages affected by this advisory is low. It requires all of the following to be true to be exploited:

Setting the Proxy-Authorization header without using urllib3's built-in proxy support.
Not disabling HTTP redirects.
Either not using an HTTPS origin server or for the proxy or target origin to redirect to a malicious origin.

Remediation

Using the Proxy-Authorization header with urllib3's ProxyManager.
Disabling HTTP redirects using redirects=False when sending requests.
Not using the Proxy-Authorization header.

Severity

CVSS Score: 4.4 / 10 (Medium)
Vector String: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

Using default SSLContext for HTTPS requests in an HTTPS proxy doesn't verify certificate hostname for proxy connection

CVE-2021-28363 / GHSA-5phf-pp7p-vc2r

More information

Details

Impact

Users who are using an HTTPS proxy to issue HTTPS requests and haven't configured their own SSLContext via proxy_config.
Only the default SSLContext is impacted.

Patches

urllib3 >=1.26.4 has the issue resolved. urllib3<1.26 is not impacted due to not supporting HTTPS requests via HTTPS proxies.

Workarounds

Upgrading is recommended as this is a minor release and not likely to break current usage.

Configuring an SSLContext with check_hostname=True and passing via proxy_config instead of relying on the default SSLContext

For more information

If you have any questions or comments about this advisory:

Email us at sethmichaellarson@gmail.com

Severity

CVSS Score: 6.9 / 10 (Medium)
Vector String: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

Catastrophic backtracking in URL authority parser when passed URL containing many @ characters

CVE-2021-33503 / GHSA-q2q7-5pp4-w6pg

More information

Details

Impact

When provided with a URL containing many @ characters in the authority component the authority regular expression exhibits catastrophic backtracking causing a denial of service if a URL were passed as a parameter or redirected to via an HTTP redirect.

Patches

The issue has been fixed in urllib3 v1.26.5.

References

For more information

If you have any questions or comments about this advisory:

Ask in our community Discord
Email sethmichaellarson@gmail.com

Severity

CVSS Score: 8.7 / 10 (High)
Vector String: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

Release Notes

urllib3/urllib3 (urllib3)

`v2.7.0`

Compare Source

=======================

Security

Addressed high-severity security issues.
Impact was limited to specific use cases detailed in the accompanying
advisories; overall user exposure was estimated to be marginal.

Decompression-bomb safeguards of the streaming API were bypassed:
1. When HTTPResponse.drain_conn() was called after the response had been
  read and decompressed partially.
2. During the second HTTPResponse.read(amt=N) or
  HTTPResponse.stream(amt=N) call when the response was decompressed
  using the official Brotli <https://pypi.org/project/brotli/>__ library.
See GHSA-mf9v-mfxr-j63j <https://github.com/urllib3/urllib3/security/advisories/GHSA-mf9v-mfxr-j63j>__
for details.
HTTP pools created using ProxyManager.connection_from_url did not strip
sensitive headers specified in Retry.remove_headers_on_redirect when
redirecting to a different host.
(GHSA-qccp-gfcp-xxvc <https://github.com/urllib3/urllib3/security/advisories/GHSA-qccp-gfcp-xxvc>__)

Deprecations and Removals

Used FutureWarning instead of DeprecationWarning for better
visibility of existing deprecation notices. Rescheduled the removal of
deprecated features to version 3.0.
(#3763 <https://github.com/urllib3/urllib3/issues/3763>__)
Removed support for end-of-life Python 3.9.
(#3720 <https://github.com/urllib3/urllib3/issues/3720>__)
Removed support for end-of-life PyPy3.10.
(#4979 <https://github.com/urllib3/urllib3/issues/4979>__)
Bumped the minimum supported pyOpenSSL version to 19.0.0.
(#3777 <https://github.com/urllib3/urllib3/issues/3777>__)

Bugfixes

Fixed a bug where HTTPResponse.read(amt=None) was ignoring decompressed
data buffered from previous partial reads.
(#3636 <https://github.com/urllib3/urllib3/issues/3636>__)
Fixed a bug where HTTPResponse.read() could cache only part of the
response after a partial read when cache_content=True.
(#4967 <https://github.com/urllib3/urllib3/issues/4967>__)
Fixed HTTPResponse.stream() and HTTPResponse.read_chunked() to handle
amt=0.
(#3793 <https://github.com/urllib3/urllib3/issues/3793>__)
Updated _TYPE_BODY type alias to include missing Iterable[str],
matching the documented and runtime behavior of chunked request bodies.
(#3798 <https://github.com/urllib3/urllib3/issues/3798>__)
Fixed LocationParseError when paths resembling schemeless URIs were
passed to HTTPConnectionPool.urlopen().
(#3352 <https://github.com/urllib3/urllib3/issues/3352>__)
Fixed BaseHTTPResponse.readinto() type annotation to accept
memoryview in addition to bytearray, matching the
io.RawIOBase.readinto contract and enabling use with
io.BufferedReader without type errors.
(#3764 <https://github.com/urllib3/urllib3/issues/3764>__)

`v2.6.3`

Compare Source

==================

Fixed a high-severity security issue where decompression-bomb safeguards of
the streaming API were bypassed when HTTP redirects were followed.
(GHSA-38jv-5279-wg99 <https://github.com/urllib3/urllib3/security/advisories/GHSA-38jv-5279-wg99>__)
Started treating Retry-After times greater than 6 hours as 6 hours by
default. (#3743 <https://github.com/urllib3/urllib3/issues/3743>__)
Fixed urllib3.connection.VerifiedHTTPSConnection on Emscripten.
(#3752 <https://github.com/urllib3/urllib3/issues/3752>__)

`v2.6.2`

Compare Source

==================

Fixed HTTPResponse.read_chunked() to properly handle leftover data in
the decoder's buffer when reading compressed chunked responses.
(#3734 <https://github.com/urllib3/urllib3/issues/3734>__)

`v2.6.1`

Compare Source

==================

Restore previously removed HTTPResponse.getheaders() and
HTTPResponse.getheader() methods.
(#3731 <https://github.com/urllib3/urllib3/issues/3731>__)

`v2.6.0`

[C

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chore(deps): update dependency urllib3 to v2.7.0 [security]

cec48ea

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chore(deps): update dependency urllib3 to v2.7.0 [security] - #5490

chore(deps): update dependency urllib3 to v2.7.0 [security]#5490
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urllib3 redirects are not disabled when retries are disabled on PoolManager instantiation

Details

Affected usages

Impact

Remediation

Severity

References

urllib3 does not control redirects in browsers and Node.js

Details

Affected usages

Impact

Remediation

Severity

References

urllib3 allows an unbounded number of links in the decompression chain

Details

Impact

Affected usages

Remediation

Severity

References

urllib3 streaming API improperly handles highly compressed data

Details

Impact

Affected usages

Remediation

Credits

Severity

References

Decompression-bomb safeguards bypassed when following HTTP redirects (streaming API)

Details

Impact

Affected usages

Remediation

Severity

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urllib3: Sensitive headers forwarded across origins in proxied low-level redirects

Details

Impact

Affected usage

Remediation

Severity

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Exposure of Sensitive Information to an Unauthorized Actor in urllib3

Details

Severity

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Improper Certificate Validation in urllib3

Details

Severity

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CRLF injection in urllib3

Details

Severity

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Improper Neutralization of CRLF Sequences in urllib3 library for Python

Details

Severity

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Cookie HTTP header isn't stripped on cross-origin redirects

Details

Affected usages

Remediation

Severity

References

Authorization Header forwarded on redirect

Details

Severity

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urllib3's request body not stripped after redirect from 303 status changes request method to GET

Details

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Remediation

Severity

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urllib3's Proxy-Authorization request header isn't stripped during cross-origin redirects

renovate Bot commented Jul 30, 2026 •

edited

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`Cookie` HTTP header isn't stripped on cross-origin redirects

Catastrophic backtracking in URL authority parser when passed URL containing many @ characters

`v2.7.0`

`v2.6.3`

`v2.6.2`

`v2.6.1`

`v2.6.0`