CVE-2025-1795

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

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.

Category

2.3
CVSS
Severity: Low
CVSS 4.0 •
EPSS 0.17%
Vendor Advisory python.org
Affected: Python Software Foundation CPython
Published at:
Updated at:

References

Link Tags
https://github.com/python/cpython/issues/100884 issue tracking
https://github.com/python/cpython/pull/100885 patch
https://github.com/python/cpython/pull/119099 patch
https://github.com/python/cpython/commit/09fab93c3d857496c0bd162797fab816c311ee48 patch
https://github.com/python/cpython/commit/70754d21c288535e86070ca7a6e90dcb670b8593 patch
https://github.com/python/cpython/commit/9148b77e0af91cdacaa7fe3dfac09635c3fe9a74 patch
https://mail.python.org/archives/list/security-announce@python.org/thread/MB62IZMEC3UM6SGHP5LET5JX2Y7H4ZUR/ vendor advisory

Frequently Asked Questions

What is the severity of CVE-2025-1795?
CVE-2025-1795 has been scored as a low severity vulnerability.
How to fix CVE-2025-1795?
To fix CVE-2025-1795, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-1795 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-1795 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-1795?
CVE-2025-1795 affects Python Software Foundation CPython.
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