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CVE-2025-11468

Published: Jan 20, 2026

Modified: Mar 3, 2026

PUBLISHED

Description

When folding a long comment in an email header containing exclusively unfoldable characters, the parenthesis would not be preserved. This could be used for injecting headers into email messages where addresses are user-controlled and not sanitized.

Vendor	Product	Versions
Python Software Foundation	CPython	affected `0 - < 3.10.20` affected `3.11.0 - < 3.11.15` affected `3.12.0 - < 3.12.13` affected `3.13.0 - < 3.13.12` affected `3.14.0 - < 3.14.3` +1 more versions

References

https://github.com/python/cpython/pull/143936

patch

https://github.com/python/cpython/issues/143935

issue-tracking

https://mail.python.org/archives/list/[email protected]/thread/FELSEOLBI2QR6YLG6Q7VYF7FWSGQTKLI/

vendor-advisory

https://github.com/python/cpython/commit/17d1490aa97bd6b98a42b1a9b324ead84e7fd8a2

patch

https://github.com/python/cpython/commit/61614a5e5056e4f61ced65008d4576f3df34acb6

patch

https://github.com/python/cpython/commit/e9970f077240c7c670e8a6fc6662f2b30d3b6ad0

patch

https://github.com/python/cpython/commit/f738386838021c762efea6c9802c82de65e87796

patch

https://github.com/python/cpython/commit/a76e4cd62dd68e7cbe86e37e6ed988495a646b66

patch

https://github.com/python/cpython/commit/003b8315669b9f08b1010a49071f73f15f818094

patch

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