Is CVE-2025-26695 in the CISA KEV catalog?

No. CVE-2025-26695 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2025-26695?

CVE-2025-26695 has a CVSS v3 base score of 5.3 (MEDIUM).

What is the EPSS score for CVE-2025-26695?

CVE-2025-26695 has an EPSS score of 0.14% (4th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2025-26695?

Upgrade thunderbird on debian 11 to 1:128.8.0esr-1~deb11u1 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2025-26695

MEDIUM

5.3

CVSS v3

NVD

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 was fixed in Thunderbird 136 and Thunderbird 128.8.

How to fix

Remediation Available

thunderbirdDebian

Fixed in:1:128.8.0esr-1~deb11u1CVE-2025-26695

Fixed in:1:128.8.0esr-1~deb12u1CVE-2025-26695

Fixed in:1:128.8.0esr-1CVE-2025-26695

thunderbirdUbuntu

Fixed in:1:128.12.0+build1-0ubuntu0.22.04.1USN-7663-1

Mozilla Thunderbird (en-US)Windows application

Affected:128.8.0Fixed in:128.8.0Mozilla

Affected:129.0 136.0Fixed in:136.0Mozilla

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityLow

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

Exploit Intelligence

0.14%probability of exploitation in 30 days

4thpercentile

Low risk: more likely to be exploited than 4% of all known CVEs.

References

Vendor Advisory2

Issue Tracking1

bugzilla.mozilla.org

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-13.