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CVE-2025-1795

Date: February 28, 2025

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.

Severity Score

Related Resources (10)

https://github.com/python/cpython/commit/9148b77e0af91cdacaa7fe3dfac09635c3fe9a74
https://github.com/python/cpython/issues/100884
https://github.com/python/cpython/commit/70754d21c288535e86070ca7a6e90dcb670b8593
https://github.com/python/cpython/pull/119099
https://github.com/python/cpython/pull/100885
https://nvd.nist.gov/vuln/detail/CVE-2025-1795
https://github.com/python/cpython/commit/09fab93c3d857496c0bd162797fab816c311ee48
https://mail.python.org/archives/list/security-announce@python.org/thread/MB62IZMEC3UM6SGHP5LET5JX2Y7H4ZUR/
https://security-tracker.debian.org/tracker/CVE-2025-1795
https://www.mend.io/vulnerability-database/CVE-2025-1795

Severity Score

Weakness Type (CWE)

Improper Encoding or Escaping of Output

CWE-116

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): HIGH
Privileges Required (PR): LOW
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): LOW
Integrity (I): NONE
Availability (A): NONE

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