Bump urllib3 from 1.26.5 to 2.7.0

[dependabot]

Bumps urllib3 from 1.26.5 to 2.7.0.

Release notes

Sourced from urllib3's releases.

2.7.0

🚀 urllib3 is fundraising for HTTP/2 support

urllib3 is raising ~$40,000 USD to release HTTP/2 support and ensure long-term sustainable maintenance of the project after a sharp decline in financial support. If your company or organization uses Python and would benefit from HTTP/2 support in Requests, pip, cloud SDKs, and thousands of other projects please consider contributing financially to ensure HTTP/2 support is developed sustainably and maintained for the long-haul.

Thank you for your support.

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. (Reported by @​Cycloctane)
  2. During the second HTTPResponse.read(amt=N) or HTTPResponse.stream(amt=N) call when the response was decompressed using the official Brotli library. (Reported by @​kimkou2024)

  See 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 reported by @​christos-spearbit)

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. (urllib3/urllib3#3763)
• Removed support for end-of-life Python 3.9. (urllib3/urllib3#3720)
• Removed support for end-of-life PyPy3.10. (urllib3/urllib3#4979)
• Bumped the minimum supported pyOpenSSL version to 19.0.0. (urllib3/urllib3#3777)

Bugfixes

• Fixed a bug where HTTPResponse.read(amt=None) was ignoring decompressed data buffered from previous partial reads. (urllib3/urllib3#3636)
• Fixed a bug where HTTPResponse.read() could cache only part of the response after a partial read when cache_content=True. (urllib3/urllib3#4967)
• Fixed HTTPResponse.stream() and HTTPResponse.read_chunked() to handle amt=0. (urllib3/urllib3#3793)
• Updated _TYPE_BODY type alias to include missing Iterable[str], matching the documented and runtime behavior of chunked request bodies. (urllib3/urllib3#3798)
• Fixed LocationParseError when paths resembling schemeless URIs were passed to HTTPConnectionPool.urlopen(). (urllib3/urllib3#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. (urllib3/urllib3#3764)

2.6.3

🚀 urllib3 is fundraising for HTTP/2 support

urllib3 is raising ~$40,000 USD to release HTTP/2 support and ensure long-term sustainable maintenance of the project after a sharp decline in financial support. If your company or organization uses Python and would benefit from HTTP/2 support in Requests, pip, cloud SDKs, and thousands of other projects please consider contributing financially to ensure HTTP/2 support is developed sustainably and maintained for the long-haul.

Thank you for your support.

Changes

• Fixed a security issue where decompression-bomb safeguards of the streaming API were bypassed when HTTP redirects were followed. (CVE-2026-21441 reported by @​D47A, 8.9 High, GHSA-38jv-5279-wg99)
• Started treating Retry-After times greater than 6 hours as 6 hours by default. (urllib3/urllib3#3743)
• Fixed urllib3.connection.VerifiedHTTPSConnection on Emscripten. (urllib3/urllib3#3752)

2.6.2

... (truncated)

Changelog

Sourced from urllib3's changelog.

2.7.0 (2026-05-07)

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) <https://github.com/urllib3/urllib3/issues/3763>__)
• Removed support for end-of-life Python 3.9. ([#3720](https://github.com/urllib3/urllib3/issues/3720) <https://github.com/urllib3/urllib3/issues/3720>__)
• Removed support for end-of-life PyPy3.10. ([#4979](https://github.com/urllib3/urllib3/issues/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) <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) <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.

... (truncated)

Commits

• 9a950b9 Release 2.7.0
• 5ec0de4 Merge commit from fork
• 2bdcc44 Merge commit from fork
• f45b0df Fix a misleading example for ProxyManager (#4970)
• 577193c Switch to nightly PyPy3.11 in CI for now (#4984)
• e90af45 Avoid infinite loop in HTTPResponse.read_chunked when amt=0 (#4974)
• 67ed74f Bump dev dependencies (#4972)
• 3abd481 Upgrade mypy to version 1.20.2 (#4978)
• 2b8725d Drop support for EOL PyPy3.10 (#4979)
• 2944b2a Upgrade setup-chrome and setup-firefox to fix warnings (#4973)
• Additional commits viewable in compare view

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[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	pypi/​urllib3@​1.26.5 ⏵ 2.7.0	+2	+50

View full report

[JonathanPorta]

PR Review

Summary

This PR bumps urllib3 from 1.26.5 to 2.7.0 in requirements.txt. The security motivation is understandable, but the implementation is not compatible with this repository as it stands: the project still targets Python 3.6 for the Lambda build path, and the pinned requests==2.20.0 dependency explicitly rejects urllib3 2.x.

Findings

• Severity: Blocking

• Location: requirements.txt, Makefile deps, Dockerfile, and setup.py package metadata

• Problem: urllib3==2.7.0 requires Python >=3.10, but the repo still creates a Python 3.6 virtualenv in Makefile, builds from lambci/lambda:build-python3.6, manually installs Python 3.6.1 in the Docker image, and advertises Python 3.6 support in setup.py.

• Why it matters: the package manager will not install this version for the Python runtime the project is explicitly built around. Since this package exists to prebuild Lambda-compatible image dependencies, accepting a runtime-incompatible dependency breaks the core build/release path.

• Suggested fix: either migrate the Lambda/build/package target to a supported Python >=3.10 runtime and validate the Docker/package build there, or choose a patched urllib3 version that still supports the repo's actual Python target.

• Severity: Blocking

• Location: requirements.txt

• Problem: requests==2.20.0 is still pinned, and that release requires urllib3>=1.21.1,<1.25; urllib3==2.7.0 is outside that range.

• Why it matters: even on a modern Python interpreter, the requirements set is internally unsatisfiable. A scratch resolver check for just requests==2.20.0 plus urllib3==2.7.0 fails with ResolutionImpossible.

• Suggested fix: update requests and the related HTTP dependency pins as a tested set, or keep urllib3 inside the version range accepted by the existing requests pin.

Test / Verification Notes

Checked the PR metadata, diff, package pins, build files, Lambda runtime assumptions, package metadata, and the requests call site in lambda_image_utils_prebuilt/unpack.py.

Ran:

• gh pr checks 19 --repo JonathanPorta/lambda_image_utils_prebuilt: Socket Security checks pass; no repo build/test check is reported.
• tar -xOf urllib3-2.7.0/PKG-INFO | rg -n "Requires-Python|Classifier: Programming Language :: Python": confirmed Requires-Python: >=3.10.
• tar -xOf requests-2.20.0/setup.py | rg -n "urllib3|requires": confirmed urllib3>=1.21.1,<1.25.
• Scratch venv resolver check for requests==2.20.0 and urllib3==2.7.0: failed with a direct dependency conflict.
• git diff --check origin/master...HEAD: passed.
• python3 -m py_compile lambda_image_utils_prebuilt/unpack.py version.py setup.py: passed.
• make test: failed because the repo has no test target.

Blessed-CICD review: because this is dependency automation, I checked policies/tracked-artifacts.md, standards/github-actions/dependabot-secret-guards.md, and docs/project-standards.md. The tracked-artifacts policy explicitly does not cover ordinary package-manager library pins, the Dependabot secret-guard standard is GitHub Actions-specific and this PR only reports Socket checks, and docs/project-standards.md treats AWS Lambda as an emerging precedent rather than a detailed dependency-runtime standard.

Overall Recommendation

Needs changes before merge.