CVE-2025-26695

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 affects Thunderbird < 136 and Thunderbird < 128.8.

5.3

CVSS

Severity: Medium

CVSS 3.1 •

EPSS 0.02%

Vendor Advisory mozilla.org Vendor Advisory mozilla.org

Affected: Mozilla Thunderbird

References

Link	Tags
https://bugzilla.mozilla.org/show_bug.cgi?id=1883039	issue tracking
https://www.mozilla.org/security/advisories/mfsa2025-17/	vendor advisory
https://www.mozilla.org/security/advisories/mfsa2025-18/	vendor advisory

Frequently Asked Questions

What is the severity of CVE-2025-26695?: CVE-2025-26695 has been scored as a medium severity vulnerability.
How to fix CVE-2025-26695?: To fix CVE-2025-26695, 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-2025-26695 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2025-26695 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-2025-26695?: CVE-2025-26695 affects Mozilla Thunderbird, Mozilla Thunderbird.

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