Medium severity · published Jan 20, 2026
CVE-2025-15367
POP3 command injection in user-controlled commands
5.9
CVSS
0.4%
EPSS
No
On KEV
Description
The poplib module, when passed a user-controlled command, can have
additional commands injected using newlines. Mitigation rejects commands
containing control characters.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 32% 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 3.15.0a6 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-15367
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-15367
github.com
https://github.com/python/cpython/commit/b234a2b67539f787e191d2ef19a7cbdce32874e7
github.com
https://github.com/python/cpython/issues/143923
github.com
https://github.com/python/cpython/pull/143924
mail.python.org
https://mail.python.org/archives/list/security-announce@python.org/thread/CBFBOWVGGUJFSGITQCCBZS4GEYYZ7ZNE/
More from CPython
9.4
CVE-2026-115557
Distrust compromised intermediate certificates in ssl module
9.4
CVE-2025-4517
Arbitrary writes via tarfile realpath overflow
9.2
CVE-2026-19445
Use-after-free of a server-side SSLContext when sni_callback switches contexts
8.8
CVE-2026-3298
Out-of-bounds write in Windows asyncio.ProacterEventLoop.sock_recvfrom_into() when using nbytes
8.7
CVE-2024-8088
Infinite loop when iterating over zip archive entry names from zipfile.Path