OpenPGP Padding Vulnerability in Thunderbird by Mozilla
CVE-2025-26695

5.3MEDIUM

Key Information:

Vendor
Mozilla
Status
Thunderbird
Vendor
CVE Published:
10 March 2025

Summary

In Thunderbird, an incorrect padding size utilized when requesting an OpenPGP key from a WKD server can lead to information disclosure. This flaw may allow a network observer to infer the length of the requested email address, potentially compromising user privacy. Affected versions include Thunderbird versions below 136 and 128.8, necessitating prompt updates to mitigate this risk.

Affected Version(s)

Thunderbird < 136

Thunderbird < 128.8

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/

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Daniel Huigens
.