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[3.13] gh-160040: Distrust compromised eMudhra intermediate CA keys (CVE-2026-115557) (GH-160042) - #160570
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…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 <christian@python.org> Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com> (cherry picked from commit 7dd8b47) Co-authored-by: Christian Heimes <christian@python.org>
This was referenced Oct 24, 2026
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(cherry picked from commit 7dd8b47)
Co-authored-by: Christian Heimes christian@python.org
Manual backport notes (3.13): 3.13's
Lib/test/certdata/make_ssl_certs.pypredates the argparsecmdlineargsrefactor, somake_distrusted_spki_cert()takes no arguments and uses the script's module-levelenddateand the literal'7000'days that the rest of the 3.13 script uses (3.13'sreq_templatehas no{days}placeholder).Makefile.pre.inandPCbuild/_ssl.vcxproj{,.filters}add onlyModules/_ssl/distrusted_spki.h(main's_openssl_mem.his main-only), plus theHeader Filesfilter definition.Modules/_ssl.c,Lib/test/test_ssl.py, the NEWS entry,distrusted_spki.handdistrusted.zipare identical to main.test_ssl,test_asyncio.test_sslandtest_asyncio.test_sslprotopass, includingtest_distrusted_spki.