CVE-2026-0818
thunderbirdVulnerabilityCVSS 4.3Patched
No public exploitation has been reported so far. A fixed version is available (see the table below).
Recommended action: Update to the fixed version listed for your distribution using the native package manager.
Severity metrics
CVSS 3.1 : 4.3 MEDIUM
Attack vectorNetwork (remote)
Attack complexityLow
Privileges requiredNone
User interactionRequired
ScopeUnchanged
Confidentiality impactLow
Integrity impactNone
Availability impactNone
Vector: AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Affected & fixed versions by distribution
Versions are the native distribution strings (backport-aware): RHEL/Debian/SUSE backport fixes, so compare with the distro version comparator (dpkg / rpm / vercmp), not the upstream version.
| Distribution | Package | Affected | Fixed version | Status |
|---|---|---|---|---|
| Debian:11 | thunderbird | - | 1:140.7.1esr-1~deb11u1 | fixed |
| Debian:12 | thunderbird | - | 1:140.7.1esr-1~deb12u1 | fixed |
| Debian:13 | thunderbird | - | 1:140.7.1esr-1~deb13u1 | fixed |
| Debian:14 | thunderbird | - | 1:140.7.1esr-1 | fixed |
| Ubuntu:22.04:LTS | thunderbird | - | 1:140.7.1+build1-0ubuntu0.22.04.1 | fixed |
| SUSE:Linux Enterprise Module for Package Hub 15 SP7 | MozillaThunderbird | - | 140.7.1-150200.8.254.1 | fixed |
| SUSE:Linux Enterprise Workstation Extension 15 SP7 | MozillaThunderbird | - | 140.7.1-150200.8.254.1 | fixed |
| openSUSE:Leap 15.6 | MozillaThunderbird | - | 140.7.1-150200.8.254.1 | fixed |
| openSUSE:Tumbleweed | MozillaThunderbird | - | 140.7.1-1.1 | fixed |
| openSUSE:Leap 16.0 | MozillaThunderbird | - | 140.8.1-bp160.1.1 | fixed |