Medium severity · published Jan 20, 2026
CVE-2025-11468
Folding email comments of unfoldable characters doesn't preserve parenthesis
5.7
CVSS
0.6%
EPSS
No
On KEV
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.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 49% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CP
CPython · Python Software Foundation
before 3.10.20; 3.11.0 before 3.11.15; 3.12.0 before 3.12.13; 3.13.0 before 3.13.12; 3.14.0 before 3.14.3; 3.15.0a1 before 3.15.0a6 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-11468
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-11468
github.com
https://github.com/python/cpython/commit/003b8315669b9f08b1010a49071f73f15f818094
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/a76e4cd62dd68e7cbe86e37e6ed988495a646b66
github.com
https://github.com/python/cpython/commit/e9970f077240c7c670e8a6fc6662f2b30d3b6ad0
github.com
https://github.com/python/cpython/commit/f738386838021c762efea6c9802c82de65e87796
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