CVE-2025-26695

MEDIUM 5.3

Downloading of OpenPGP keys from WKD used incorrect padding

CVSS Score

5.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

Vendor	mozilla
Product	thunderbird
Ecosystems	Browser JavaScript
Industries	Technology
Published	Mar 10, 2025
Last Updated	Apr 13, 2026

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Affected Versions

Mozilla / Thunderbird

All versions affected

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

Daniel Huigens