chore(deps): update dependency urllib3 to v2.6.0 [security] by renovate[bot] · Pull Request #113 · headlesshq/mc-runtime-test

renovate · 2025-12-07T16:14:28Z

This PR contains the following updates:

Package	Change	Age	Confidence
urllib3 (changelog)	`==2.5.0` -> `==2.6.0`

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GitHub Vulnerability Alerts

CVE-2025-66418

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.

CVE-2025-66471

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.

Release Notes

urllib3/urllib3 (urllib3)

`v2.6.0`

Compare Source

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

Security

Fixed a security issue where streaming API could improperly handle highly
compressed HTTP content ("decompression bombs") leading to excessive resource
consumption even when a small amount of data was requested. Reading small
chunks of compressed data is safer and much more efficient now.
(GHSA-2xpw-w6gg-jr37 <https://github.com/urllib3/urllib3/security/advisories/GHSA-2xpw-w6gg-jr37>__)
Fixed a security issue where an attacker could compose an HTTP response with
virtually unlimited links in the Content-Encoding header, potentially
leading to a denial of service (DoS) attack by exhausting system resources
during decoding. The number of allowed chained encodings is now limited to 5.
(GHSA-gm62-xv2j-4w53 <https://github.com/urllib3/urllib3/security/advisories/GHSA-gm62-xv2j-4w53>__)

.. caution::

If urllib3 is not installed with the optional urllib3[brotli] extra, but
your environment contains a Brotli/brotlicffi/brotlipy package anyway, make
sure to upgrade it to at least Brotli 1.2.0 or brotlicffi 1.2.0.0 to
benefit from the security fixes and avoid warnings. Prefer using
urllib3[brotli] to install a compatible Brotli package automatically.
If you use custom decompressors, please make sure to update them to
respect the changed API of urllib3.response.ContentDecoder.

Features

Enabled retrieval, deletion, and membership testing in HTTPHeaderDict using bytes keys. (#3653 <https://github.com/urllib3/urllib3/issues/3653>__)
Added host and port information to string representations of HTTPConnection. (#3666 <https://github.com/urllib3/urllib3/issues/3666>__)
Added support for Python 3.14 free-threading builds explicitly. (#3696 <https://github.com/urllib3/urllib3/issues/3696>__)

Removals

Removed the HTTPResponse.getheaders() method in favor of HTTPResponse.headers.
Removed the HTTPResponse.getheader(name, default) method in favor of HTTPResponse.headers.get(name, default). (#3622 <https://github.com/urllib3/urllib3/issues/3622>__)

Bugfixes

Fixed redirect handling in urllib3.PoolManager when an integer is passed
for the retries parameter. (#3649 <https://github.com/urllib3/urllib3/issues/3649>__)
Fixed HTTPConnectionPool when used in Emscripten with no explicit port. (#3664 <https://github.com/urllib3/urllib3/issues/3664>__)
Fixed handling of SSLKEYLOGFILE with expandable variables. (#3700 <https://github.com/urllib3/urllib3/issues/3700>__)

Misc

Changed the zstd extra to install backports.zstd instead of zstandard on Python 3.13 and before. (#3693 <https://github.com/urllib3/urllib3/issues/3693>__)
Improved the performance of content decoding by optimizing BytesQueueBuffer class. (#3710 <https://github.com/urllib3/urllib3/issues/3710>__)
Allowed building the urllib3 package with newer setuptools-scm v9.x. (#3652 <https://github.com/urllib3/urllib3/issues/3652>__)
Ensured successful urllib3 builds by setting Hatchling requirement to >= 1.27.0. (#3638 <https://github.com/urllib3/urllib3/issues/3638>__)

Configuration

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This PR was generated by Mend Renovate. View the repository job log.

* chore(mod): 1.21.5 (headlesshq#64) * chore(deps): update googleapis/release-please-action digest to a02a34c (headlesshq#62) Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com> * feat(deps): support 1.21.5 and update to HeadlessMc 2.5.1 * chore(main): release 3.1.0 (headlesshq#68) Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com> * chore(docs): escape characters in README (headlesshq#69) * fix(action): Change cache keys to prevent prefix fallback to cache of incorrect version (headlesshq#71) * chore(main): release 3.1.1 (headlesshq#72) Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com> * chore(deps): update useblacksmith/setup-gradle digest to 7f7b355 (headlesshq#75) Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com> * chore(deps): update actions/download-artifact digest to d3f86a1 (headlesshq#65) Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com> * chore(deps): update useblacksmith/setup-java digest to 4ef8123 (headlesshq#63) Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com> * chore(deps): update actions/upload-artifact digest to ea165f8 (headlesshq#55) Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com> * fix(deps): update dependency net.fabricmc.fabric-api:fabric-gametest-api-v1 to v1.3.16+1172e8970d (headlesshq#76) Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com> * feat!: Default to github cache, blacksmith or no cache are configurable, extensive 1.7.10 logging (headlesshq#74) Co-authored-by: Chip Wolf ‮ <hello@chipwolf.uk> Co-authored-by: Chip Wolf ‮ <chipukyt@gmail.com> Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com> * chore(main): release 4.0.0 (headlesshq#78) Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com> * chore(ci): automatic PR when new Mc version is available (headlesshq#85) * chore(ci): add requirements.txt * chore(ci): fix new mc version workflow (headlesshq#88) * chore(ci): fix reviewers and syntax in new mc version workflow (headlesshq#90) * chore(ci): run matrix based on PR message (headlesshq#92) * chore(ci): use find-comment action to find PR comment (headlesshq#94) * chore(ci): use pull_request.body * chore(ci): log PR comment body matching * chore(ci): Fixed regex for PR comment body matching * chore(ci): Fixed regex for PR comments not matching zeros * chore(ci): modify README in new mc version workflow (headlesshq#103) * feat(mod): Support 1.21.6 (headlesshq#81) Co-authored-by: okafke <65917827+okafke@users.noreply.github.com> * fix(action): switch from wget to curl to support windows (headlesshq#104) * chore(main): release 4.1.0 (headlesshq#106) Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com> * chore(docs): add supported versions to README * chore(ci): read build & run data from file (headlesshq#111) * chore(ci): improve README modification * chore(deps): update dependency urllib3 to v2.6.0 [security] (headlesshq#113) Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com> * refactor: 1.21.10 already handled by 1_21_9 * ci: null2264 * ci: Use github cache * ci: Use github cache * refactor: Switching to uv --------- Co-authored-by: 3arthqu4ke <56741599+3arthqu4ke@users.noreply.github.com> Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com> Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com> Co-authored-by: Chip Wolf ‮ <hello@chipwolf.uk> Co-authored-by: Chip Wolf ‮ <chipukyt@gmail.com> Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com> Co-authored-by: okafke <65917827+okafke@users.noreply.github.com>

chore(deps): update dependency urllib3 to v2.6.0 [security]

5f1684e

renovate bot added the dependency/minor label Dec 7, 2025

okafke self-requested a review December 7, 2025 17:27

okafke approved these changes Dec 7, 2025

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okafke merged commit 398830d into main Dec 7, 2025
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okafke deleted the renovate/pypi-urllib3-vulnerability branch December 7, 2025 17:27

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chore(deps): update dependency urllib3 to v2.6.0 [security]#113

chore(deps): update dependency urllib3 to v2.6.0 [security]#113
okafke merged 1 commit intomainfrom
renovate/pypi-urllib3-vulnerability

renovate bot commented Dec 7, 2025

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renovate bot commented Dec 7, 2025

GitHub Vulnerability Alerts

CVE-2025-66418

Impact

Affected usages

Remediation

CVE-2025-66471

Impact

Affected usages

Remediation

Credits

Release Notes

v2.6.0

Security

Features

Removals

Bugfixes

Misc

Configuration

Uh oh!

Uh oh!

Reviewers

Assignees

Labels

Projects

Milestone

Development

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1 participant

`v2.6.0`