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[3.9.25.1] Upgrade bundled pip to 26.0.1.post3 (vendored urllib3 1.26.20.post4) - #112
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ensurepip now bundles ActiveState pip 26.0.1.post3 instead of 26.0.1.post2: https://github.com/ActiveState/pip/releases/tag/26.0.1.post3 It is 26.0.1.post2 (certifi 2026.10.23) plus ActiveState urllib3 1.26.20.post4 as its vendored urllib3, fixing CVE-2025-50181, CVE-2025-66418, CVE-2025-66471, CVE-2026-21441, CVE-2026-44431, CVE-2026-97687 and CVE-2026-97689 (raised in the review of #110: the vendored urllib3 1.26.20 in 26.0.1.post2 had them open), and the requests 2.33.0 fix for CVE-2026-25645. The NEWS entry and What's New are updated to match. Wheel sha256 be55af8fd6e6afe2728f7539eae1ebe00e64264922f740aedfea619847a6e1d0, matching the release notes. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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No blockers. The bundled pip-26.0.1.post3-py3-none-any.whl is byte-identical to the ActiveState pip 26.0.1.post3 release asset (sha256 be55af8f…), and the previous wheel is removed. That release was built from the 26.0.1.post3 tag, whose tree is the reviewed head of ActiveState/pip#15: the wheel's pip/ matches the tag's src/pip apart from the six _vendor/*.pyi stubs, which wheels leave out. _PIP_VERSION is 26.0.1.post3. In a Python 3.9 venv, python -m ensurepip from this tree installs pip 26.0.1.post3 and setuptools 82.0.1.post1, with vendored certifi 2026.10.23 and the patched urllib3 fork (max_decode_links present). What's New and the NEWS entry describe both.
This was referenced Oct 28, 2026
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Follow-up to #109 for 3.9.25.1. It moves ensurepip's bundled pip from 26.0.1.post2 to ActiveState pip 26.0.1.post3, the same pip #110 now bundles for 3.10. Linear PROD-1555.
Why
The review of #110 pointed out that pip 26.0.1.post2 still vendored an unpatched urllib3 1.26.20. pip 26.0.1.post3 (ActiveState/pip#15) vendors ActiveState urllib3 1.26.20.post4 instead, which fixes CVE-2025-50181, CVE-2025-66418, CVE-2025-66471, CVE-2026-21441, CVE-2026-44431, CVE-2026-97687 and CVE-2026-97689. It also carries the requests 2.33.0 fix for CVE-2026-25645. Everything else matches 26.0.1.post2, including certifi 2026.10.23.
Change
pip-26.0.1.post3-py3-none-any.whlreplaces 26.0.1.post2. It's the release asset, sha256be55af8f…e1d0._PIP_VERSIONis set to"26.0.1.post3".Testing (Linux x86_64, our 3.9.25.1 build with this branch's
ensurepip)test_ensurepippasses.--without-pipvenv,ensurepip --upgradeinstalls pip 26.0.1.post3 and setuptools 82.0.1.post1.RequestsDependencyWarningunder-W error.pip download six==1.16.0from PyPI works.