CVE-2025-11468

EUVD-2025-206306
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.
CRLF Injection
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
PSFCNA
5.7 MEDIUM
NETWORK
LOW
HIGH
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
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
pythoncpython
𝑥
< 3.10.20
CNA
pythoncpython
3.11.0 ≤
𝑥
< 3.11.15
CNA
pythoncpython
3.12.0 ≤
𝑥
< 3.12.13
CNA
pythoncpython
3.13.0 ≤
𝑥
< 3.13.12
CNA
pythoncpython
3.14.0 ≤
𝑥
< 3.14.3
CNA
Common Weakness Enumeration
Vulnerability Media Exposure
References
https://github.com/python/cpython/commit/003b8315669b9f08b1010a49071f73f15f818094
https://github.com/python/cpython/commit/17d1490aa97bd6b98a42b1a9b324ead84e7fd8a2
https://github.com/python/cpython/commit/61614a5e5056e4f61ced65008d4576f3df34acb6
https://github.com/python/cpython/commit/a76e4cd62dd68e7cbe86e37e6ed988495a646b66
https://github.com/python/cpython/commit/e9970f077240c7c670e8a6fc6662f2b30d3b6ad0
https://github.com/python/cpython/commit/f738386838021c762efea6c9802c82de65e87796
https://github.com/python/cpython/issues/143935
https://github.com/python/cpython/pull/143936
https://mail.python.org/archives/list/security-announce@python.org/thread/FELSEOLBI2QR6YLG6Q7VYF7FWSGQTKLI/