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GeezerVison is showing github.com — [3.15] gh-160040: Distrust compromised eMudhra intermediate CA keys (CVE-2026-115557) (GH-160042) by gpshead · Pull Request #160568 · python/cpython

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@gpshead

@gpshead gpshead commented Oct 24, 2026

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(cherry picked from commit 7dd8b47)

Co-authored-by: Christian Heimes [email protected]

Manual backport notes (3.15): Makefile.pre.in and PCbuild/_ssl.vcxproj{,.filters} conflicted only because main also lists Modules/_openssl_mem.h (gh-156228, main-only). Resolved by adding just Modules/_ssl/distrusted_spki.h; the filters file also gains the Header Files filter definition (same GUID as main) since 3.15 had no headers listed. All other files are identical to the main commit. test_ssl, test_asyncio.test_ssl and test_asyncio.test_sslproto pass, including test_distrusted_spki.

  • Issue: ssl: distrust compromised eMudhra intermediate CA keys #160040

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@tiran @gpshead
[3.15] pythongh-160040: Distrust compromised eMudhra intermediate CA …
8d6d823 
…keys (CVE-2026-115557) (pythonGH-160042)

The ssl module now rejects TLS certificate chains that contain any of a set of
compromised eMudhra intermediate CA keys.  This is an extraordinary measure and
a last line of defense: removing trust is primarily the job of the platform root
store, and the built-in denylist only blocks connections while that update has
not yet reached the OS, a container image, or a bundled trust store in various
Python packages.  Entries are added to the denylist only under a very high
threshold.

The denylist matches on the public key (the SHA-256 digest of the RFC-5280
SubjectPublicKeyInfo), so it also covers the cross-signed certificates that
reuse one of the distrusted keys.

---------

Signed-off-by: Christian Heimes <[email protected]>
Co-authored-by: Claude Opus 4.8 (1M context) <[email protected]>

(cherry picked from commit 7dd8b47)

Co-authored-by: Christian Heimes <[email protected]>
This was referenced Oct 24, 2026
ssl: distrust compromised eMudhra intermediate CA keys #160040
Closed
gh-160040: Distrust compromised eMudhra intermediate CA keys (CVE-2026-115557) #160042
Merged
@bedevere-app bedevere-app Bot added the type-security A security issue label Oct 24, 2026
@gpshead
gpshead marked this pull request as ready for review October 24, 2026 07:11
@gpshead
gpshead requested review from AA-Turner, emmatyping, erlend-aasland and picnixz as code owners October 24, 2026 07:11
@bedevere-app bedevere-app Bot added the awaiting core review label Oct 24, 2026
@gpshead gpshead added the release-blocker label Oct 24, 2026
@github-project-automation github-project-automation Bot added this to Release and Deferred blockers 🚫 Oct 24, 2026
@github-project-automation github-project-automation Bot moved this to Todo in Release and Deferred blockers 🚫 Oct 24, 2026
@gpshead
gpshead merged commit 36cd295 into python:3.15 Oct 24, 2026
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@bedevere-app bedevere-app Bot removed the awaiting core review label Oct 24, 2026
@github-project-automation github-project-automation Bot moved this from Todo to Done in Release and Deferred blockers 🚫 Oct 24, 2026
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@picnixz picnixz Awaiting requested review from picnixz picnixz is a code owner
@erlend-aasland erlend-aasland Awaiting requested review from erlend-aasland erlend-aasland is a code owner
@AA-Turner AA-Turner Awaiting requested review from AA-Turner AA-Turner is a code owner
@emmatyping emmatyping Awaiting requested review from emmatyping emmatyping is a code owner

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@gpshead @tiran
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