CVE-2025-26695

CVE-2025-26695 is a medium-severity vulnerability in Mozilla Thunderbird with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

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.

Frequently asked questions

What is CVE-2025-26695?
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 severe is CVE-2025-26695?
CVE-2025-26695 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2025-26695 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-26695?
CVE-2025-26695 affects Mozilla Thunderbird. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-26695?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-26695 have an EU (EUVD) identifier?
Yes. CVE-2025-26695 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-7705.
When was CVE-2025-26695 published?
CVE-2025-26695 was published on 2025-03-10 and last updated on 2026-06-17.

References

Affected products (1)

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