Vulnerability · Published Mar 10, 2025 · Assigned by mozilla
CVE-2025-26695Downloading of OpenPGP keys from WKD used incorrect padding
Medium 5.3
In plain English
A medium-severity security flaw in Thunderbird from Mozilla. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 5% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)0.2%top 95.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:8 | thunderbird | 128.8.0-2.el8_10.alma.1 | ALSA-2025:2900 |
| Debian:12 | thunderbird | 1:128.8.0esr-1~deb12u1 | DSA-5876-1 |
| Debian:12 | thunderbird | 1:128.8.0esr-1~deb12u1 | DEBIAN-CVE-2025-26695 |
| Debian:13 | thunderbird | 1:128.8.0esr-1 | DEBIAN-CVE-2025-26695 |
| Debian:14 | thunderbird | 1:128.8.0esr-1 | DEBIAN-CVE-2025-26695 |
| Ubuntu:22.04:LTS | thunderbird | 1:128.12.0+build1-0ubuntu0.22.04.1 | USN-7663-1 |
| Ubuntu:22.04:LTS | thunderbird | 1:128.12.0+build1-0ubuntu0.22.04.1 | UBUNTU-CVE-2025-26695 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Thunderbird | see references |