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CVE-2025-11468

Good to know:

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Date: January 20, 2026

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.

Severity Score

Related Resources (10)

https://github.com/python/cpython/issues/143935
https://github.com/python/cpython/commit/17d1490aa97bd6b98a42b1a9b324ead84e7fd8a2
https://nvd.nist.gov/vuln/detail/CVE-2025-11468
https://github.com/python/cpython/pull/143936
https://github.com/python/cpython/commit/f738386838021c762efea6c9802c82de65e87796
https://github.com/python/cpython/commit/61614a5e5056e4f61ced65008d4576f3df34acb6
https://github.com/python/cpython/commit/a76e4cd62dd68e7cbe86e37e6ed988495a646b66
https://github.com/python/cpython/commit/e9970f077240c7c670e8a6fc6662f2b30d3b6ad0
https://mail.python.org/archives/list/security-announce@python.org/thread/FELSEOLBI2QR6YLG6Q7VYF7FWSGQTKLI/
https://www.mend.io/vulnerability-database/CVE-2025-11468

Severity Score

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): HIGH
User Interaction (UI): REQUIRED
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): HIGH
Availability (A): NONE

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