CVE-2025-26695

Downloading of OpenPGP keys from WKD used incorrect padding

State: Published
Severity: 5.3 Medium
Published: Mar 10, 2025
Updated: Apr 13, 2026
Reserved: Feb 13, 2025

Description

When requesting an OpenPGP key from a WKD server, an incorrect padding size was used and a network observer could have learned the length of the requested email address. This vulnerability was fixed in Thunderbird 136 and Thunderbird 128.8.

Scores

CVSS	Score	Vector	Source
3.1	5.3 Medium	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L	CISA-ADP

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
ThunderbirdMozilla	128.8 through 128.*Not affected 136 and laterNot affected

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1883039
https://www.mozilla.org/security/advisories/mfsa2025-17/
https://www.mozilla.org/security/advisories/mfsa2025-18/

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