Sourced fromurllib3's releases.

2.5.0

🚀 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 projectsplease consider contributing financially to ensure HTTP/2 support is developed sustainably and maintained for the long-haul.

Thank you for your support.

Security issues

urllib3 2.5.0 fixes two moderate security issues:

• Pool managers now properly control redirects whenretries is passed —CVE-2025-50181 reported by@​sandumjacob (5.3 Medium,GHSA-pq67-6m6q-mj2v)
• Redirects are now controlled by urllib3 in the Node.js runtime —CVE-2025-50182 (5.3 Medium,GHSA-48p4-8xcf-vxj5)

Features

• Added support for thecompression.zstd module that is new in Python 3.14. SeePEP 784 for more information. (#3610)
• Added support for version 0.5 ofhatch-vcs (#3612)

Bugfixes

• Raised exception forHTTPResponse.shutdown on a connection already released to the pool. (#3581)
• Fixed incorrectCONNECT statement when using an IPv6 proxy withconnection_from_host. Previously would not be wrapped in[]. (#3615)

2.4.0

🚀 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 projectsplease consider contributing financially to ensure HTTP/2 support is developed sustainably and maintained for the long-haul.

Thank you for your support.

Features

• Applied PEP 639 by specifying the license fields in pyproject.toml. (#3522)
• Updated exceptions to save and restore more properties during the pickle/serialization process. (#3567)
• Addedverify_flags option tocreate_urllib3_context with a default ofVERIFY_X509_PARTIAL_CHAIN andVERIFY_X509_STRICT for Python 3.13+. (#3571)

Bugfixes

• Fixed a bug with partial reads of streaming data in Emscripten. (#3555)

Misc

• Switched to uv for installing development dependecies. (#3550)
• Removed themultiple.intoto.jsonl asset from GitHub releases. Attestation of release files since v2.3.0 can be found on PyPI. (#3566)

2.3.0

... (truncated)

Sourced fromurllib3's changelog.

2.5.0 (2025-06-18)

Features

• Added support for thecompression.zstd module that is new in Python 3.14.SeePEP 784 <https://peps.python.org/pep-0784/>_ for more information. ([#3610](https://github.com/urllib3/urllib3/issues/3610) <https://github.com/urllib3/urllib3/issues/3610>__)
• Added support for version 0.5 ofhatch-vcs ([#3612](https://github.com/urllib3/urllib3/issues/3612) <https://github.com/urllib3/urllib3/issues/3612>__)

Bugfixes

• Fixed a security issue where restricting the maximum number of followedredirects at theurllib3.PoolManager level via theretries parameterdid not work.
• Made the Node.js runtime respect redirect parameters such asretriesandredirects.
• Raised exception forHTTPResponse.shutdown on a connection already released to the pool. ([#3581](https://github.com/urllib3/urllib3/issues/3581) <https://github.com/urllib3/urllib3/issues/3581>__)
• Fixed incorrectCONNECT statement when using an IPv6 proxy withconnection_from_host. Previously would not be wrapped in[]. ([#3615](https://github.com/urllib3/urllib3/issues/3615) <https://github.com/urllib3/urllib3/issues/3615>__)

2.4.0 (2025-04-10)

Features

• Applied PEP 639 by specifying the license fields in pyproject.toml. ([#3522](https://github.com/urllib3/urllib3/issues/3522) <https://github.com/urllib3/urllib3/issues/3522>__)
• Updated exceptions to save and restore more properties during the pickle/serialization process. ([#3567](https://github.com/urllib3/urllib3/issues/3567) <https://github.com/urllib3/urllib3/issues/3567>__)
• Addedverify_flags option tocreate_urllib3_context with a default ofVERIFY_X509_PARTIAL_CHAIN andVERIFY_X509_STRICT for Python 3.13+. ([#3571](https://github.com/urllib3/urllib3/issues/3571) <https://github.com/urllib3/urllib3/issues/3571>__)

Bugfixes

• Fixed a bug with partial reads of streaming data in Emscripten. ([#3555](https://github.com/urllib3/urllib3/issues/3555) <https://github.com/urllib3/urllib3/issues/3555>__)

Misc

• Switched to uv for installing development dependecies. ([#3550](https://github.com/urllib3/urllib3/issues/3550) <https://github.com/urllib3/urllib3/issues/3550>__)
• Removed themultiple.intoto.jsonl asset from GitHub releases. Attestation of release files since v2.3.0 can be found on PyPI. ([#3566](https://github.com/urllib3/urllib3/issues/3566) <https://github.com/urllib3/urllib3/issues/3566>__)

2.3.0 (2024-12-22)

... (truncated)

• aaab4ec Release 2.5.0
• 7eb4a2a Merge commit from fork
• f05b132 Merge commit from fork
• d03fe32 Fix HTTP tunneling with IPv6 in older Python versions
• 11661e9 Bump github/codeql-action from 3.28.0 to 3.29.0 (#3624)
• 6a0ecc6 Update v2 migration guide to 2.4.0 (#3621)
• 8e32e60 Raise exception for shutdown on a connection already released to the pool (#3...
• 9996e0f Fix emscripten CI for Chrome 137+ (#3599)
• 4fd1a99 Bump RECENT_DATE (#3617)
• c4b5917 Add support for the newcompression.zstd module in Python 3.14 (#3611)
• Additional commits viewable incompare view

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