CVE-2025-11468

MEDIUM

Email Client - Info Disclosure

Title source: llm

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.

References (9)

[Patch] https://github.com/python/cpython/commit/17d1490aa97bd6b98a42b1a9b324ead84e7fd8a2

[Patch] https://github.com/python/cpython/commit/61614a5e5056e4f61ced65008d4576f3df34acb6

View Patch ZIP pw:eip

[Issue Tracking] https://github.com/python/cpython/pull/143936

[Issue Tracking] https://github.com/python/cpython/issues/143935

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

[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

Scores

CVSS v4 5.7

EPSS 0.0004

EPSS Percentile 11.5%

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

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-93

Status published

Products (6)

Python Software Foundation/CPython < 3.10.20

Python Software Foundation/CPython 3.11.0 - 3.11.15

Python Software Foundation/CPython 3.12.0 - 3.12.13

Python Software Foundation/CPython 3.13.0 - 3.13.12

Python Software Foundation/CPython 3.14.0 - 3.14.3

Python Software Foundation/CPython 3.15.0a1 - 3.15.0a6

Published Jan 20, 2026

Tracked Since Feb 18, 2026