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CVE-2025-26695

Downloading of OpenPGP keys from WKD used incorrect padding

MEDIUM
5.3
CVSS Score
Published: March 10, 2025 at 06:41 PM UTC
Updated: June 17, 2026 at 09:02 AM UTC
1 product affected across 1 vendorThunderbird

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Severity
MEDIUM5.3
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Thunderbird· Mozilla
95%
v < 128.8.0129.0 ≤ v < 136.0
Vendor states this is fixed in 128.8 (unaffected)
Affected range stops below 128.8.0, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 136 (unaffected)
Affected range stops below 136.0, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

Issue Tracking
Source: [email protected]
https://bugzilla.mozilla.org/show_bug.cgi?id=1883039
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2025-17/
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2025-18/

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.3MEDIUMCISA-ADP
Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
LOW
Vector?

Quick Info

StatusMODIFIED
CWE
NVD-CWE-noinfo

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