CVE-2025-26695

low-risk

Published 2025-03-10

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.

Do I need to act?

0.04% chance of exploitation

EPSS score — low exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 5.3/10 Medium

LOCAL / LOW complexity

Affected Products (1)

Thunderbird

Affected Vendors

Mozilla

References (3)

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/

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low-risk

Severity 18/34 · Moderate

Exploitability 0/34 · Minimal

Exposure 5/34 · Minimal