CVE-2025-11468
Folding email comments of unfoldable characters doesn't preserve parenthesis
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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 | python software foundation |
| Product | cpython |
| Published | Jan 20, 2026 |
| Last Updated | Mar 3, 2026 |
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Affected Versions
Python Software Foundation / CPython
0 < 3.10.20 3.11.0 < 3.11.15 3.12.0 < 3.12.13 3.13.0 < 3.13.12 3.14.0 < 3.14.3 3.15.0a1 < 3.15.0a6
References
github.com: https://github.com/python/cpython/pull/143936 github.com: https://github.com/python/cpython/issues/143935 mail.python.org: https://mail.python.org/archives/list/[email protected]/thread/FELSEOLBI2QR6YLG6Q7VYF7FWSGQTKLI/ github.com: https://github.com/python/cpython/commit/17d1490aa97bd6b98a42b1a9b324ead84e7fd8a2 github.com: https://github.com/python/cpython/commit/61614a5e5056e4f61ced65008d4576f3df34acb6 github.com: https://github.com/python/cpython/commit/e9970f077240c7c670e8a6fc6662f2b30d3b6ad0 github.com: https://github.com/python/cpython/commit/f738386838021c762efea6c9802c82de65e87796 github.com: https://github.com/python/cpython/commit/a76e4cd62dd68e7cbe86e37e6ed988495a646b66 github.com: https://github.com/python/cpython/commit/003b8315669b9f08b1010a49071f73f15f818094
Credits
🔍 Denis Ledoux Seth Larson Denis Ledoux R. David Murray