CVE-2025-26695 Downloading of OpenPGP keys from WKD used incorrect padding
A network observer could learn the length of requested email addresses due to incorrect padding in OpenPGP key downloads.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-26695?
CVE-2025-26695 is a medium-severity vulnerability in Mozilla Thunderbird, published on 10 Mar 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Which versions are affected by CVE-2025-26695?
It affects 1 product.
Products include Mozilla Thunderbird.
How do I fix CVE-2025-26695?
Upgrade to a fixed version.
Is CVE-2025-26695 being exploited?
There is no known exploitation of CVE-2025-26695 in the wild and no public exploit code.
Other vulnerabilities in Mozilla Thunderbird
Sources
Also known as DEBIAN-CVE-2025-26695, GHSA-29qq-gf32-fj2m, UBUNTU-CVE-2025-26695.