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.
References (3)
Core 3
Core References
Issue Tracking
https://bugzilla.mozilla.org/show_bug.cgi?id=1883039
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-17/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-18/
Scores
CVSS v3
5.3
EPSS
0.0005
EPSS Percentile
15.2%
Attack Vector
LOCAL
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
Status
published
Products (3)
mozilla/thunderbird
< 128.8.0
Mozilla/Thunderbird
128.8 - 128.*
Mozilla/Thunderbird
136
Published
Mar 10, 2025
Tracked Since
Feb 18, 2026