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CVE-2025-1795

Mishandling of comma during folding and unicode-encoding of email headers

LOW
2.3
CVSS Score
Published: February 28, 2025 at 06:59 PM UTC
Updated: July 31, 2026 at 02:16 PM UTC
1 product affected across 1 vendorPython

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Severity
LOW2.3
Exploit prediction
EPSS 0.6%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Python· Python
60%
v < 3.9.233.10.0 ≤ v < 3.10.173.11.0 ≤ v < 3.11.93.12.0 ≤ v < 3.12.33.13.0a1 ≤ v < 3.13.0a53.10.03.11.03.12.03.13.0a1
Affected range stops below 3.10.17, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.11.9, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.12.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.13.0a5, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.9.23, so it looks safe — our inference, not a vendor statement

References (10)

Patch
Source: [email protected]
https://github.com/python/cpython/commit/09fab93c3d857496c0bd162797fab816c311ee48
Patch
Source: [email protected]
https://github.com/python/cpython/commit/70754d21c288535e86070ca7a6e90dcb670b8593
Patch
Source: [email protected]
https://github.com/python/cpython/commit/9148b77e0af91cdacaa7fe3dfac09635c3fe9a74
Issue Tracking
Source: [email protected]
https://github.com/python/cpython/issues/100884
Patch
Source: [email protected]
https://github.com/python/cpython/pull/100885
Patch
Source: [email protected]
https://github.com/python/cpython/pull/119099
Vendor Advisory
Source: [email protected]
https://mail.python.org/archives/list/[email protected]/thread/MB62IZMEC3UM6SGHP5LET5JX2Y7H4ZUR/
Patch
Source: cverecord
https://github.com/python/cpython/commit/a4ef689ce670684ec132204b1cd03720c8e0a03d

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

2.3LOWPSF
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-116

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