CVE-2025-11468
Folding email comments of unfoldable characters doesn't preserve parenthesis
- State
- Published
- Severity
- 5.7 Medium
- Published
- Jan 20, 2026
- Updated
- Mar 3, 2026
- Reserved
- Oct 7, 2025
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 5.7 Medium | CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N | PSF |
Weaknesses
- CWE-93 Improper Neutralization of CRLF Sequences ('CRLF Injection')
Affected Products
| Product | Versions |
|---|---|
CPythonPython Software Foundation |
|
References
- https://github.com/python/cpython/pull/143936patch
- https://github.com/python/cpython/issues/143935issue-tracking
- https://mail.python.org/archives/list/security-announce@python.org/thread/FELSEOLBI2QR6YLG6Q7VYF7FWSGQTKLI/vendor-advisory
- https://github.com/python/cpython/commit/17d1490aa97bd6b98a42b1a9b324ead84e7fd8a2patch
- https://github.com/python/cpython/commit/61614a5e5056e4f61ced65008d4576f3df34acb6patch
- https://github.com/python/cpython/commit/e9970f077240c7c670e8a6fc6662f2b30d3b6ad0patch
- https://github.com/python/cpython/commit/f738386838021c762efea6c9802c82de65e87796patch
- https://github.com/python/cpython/commit/a76e4cd62dd68e7cbe86e37e6ed988495a646b66patch
- https://github.com/python/cpython/commit/003b8315669b9f08b1010a49071f73f15f818094patch
Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.