CVE-2025-1795

LOW

CPython Email Header Injection via Address List Folding

Title source: llm
STIX 2.1

Description

During an address list folding when a separating comma ends up on a folded line and that line is to be unicode-encoded then the separator itself is also unicode-encoded. Expected behavior is that the separating comma remains a plan comma. This can result in the address header being misinterpreted by some mail servers.

References (10)

Core 10
Core References
Issue Tracking issue-tracking
https://github.com/python/cpython/issues/100884

Scores

CVSS v4 2.3
EPSS 0.0057
EPSS Percentile 42.3%
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-116
Status published
Products (6)
Python Software Foundation/CPython < 3.10.17
Python Software Foundation/CPython < 3.9.23
Python Software Foundation/CPython 3.10.0 - 3.10.17
Python Software Foundation/CPython 3.11.0 - 3.11.9
Python Software Foundation/CPython 3.12.0 - 3.12.3
Python Software Foundation/CPython 3.13.0a1 - 3.13.0a5
Published Feb 28, 2025
Tracked Since Feb 18, 2026