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[3.12] gh-160040: Distrust compromised eMudhra intermediate CA keys (CVE-2026-115557) (GH-160042) - #160571
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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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October 24, 2026 07:12
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(I'll keep an eye on the docs build post-merge CI, but as it was an infrastructure failure I didn't want to rerun everything to verify pre-merge.) |
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(cherry picked from commit 7dd8b47)
Co-authored-by: Christian Heimes christian@python.org
Manual backport notes (3.12):
Modules/_ssl.c: 3.12 predates _ssl.c calls SSL_CTX_get_verify_callback unnecessarily #113332, so_set_verify_mode()still fetched and re-installed the current ctx verify callback. It now installs_ssl_verify_callbackdirectly, as on main (the unusedverify_cblocal is dropped; CPython never installs a callback of its own).newPySSLSocket()'s post-handshake-auth path already passesSSL_get_verify_callback()through, which is what main's hunk there introduces, so it is unchanged.Lib/test/test_ssl.py: 3.12 lacks main'sLEAF_MISSING_AKI_*constants; theDISTRUSTED_SPKI_*block is placed afterSIGNED_CERTFILE_ECC_HOSTNAME. The test itself is unchanged.Lib/test/certdata/make_ssl_certs.py: 3.12 predates the argparsecmdlineargsrefactor, somake_distrusted_spki_cert()takes no arguments and uses the module-levelenddateand literal'7000'days like the rest of the 3.12 script.Makefile.pre.in/PCbuild/_ssl.vcxproj{,.filters}: add onlyModules/_ssl/distrusted_spki.h(main's_openssl_mem.his main-only), plus theHeader Filesfilter definition.distrusted_spki.h,distrusted.zipand the NEWS entry are identical to main.test_ssl,test_asyncio.test_sslandtest_asyncio.test_sslprotopass, includingtest_distrusted_spki; no new_ssl.ccompiler warnings.