Description
A double-free could have occurred in `vpx_codec_enc_init_multi` after a failed allocation when initializing the encoder for WebRTC. This could have caused memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 139 and Thunderbird < 128.11.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Thunderbird | unspecified – < 139, unspecified – < 128.11 | 139 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | mozjs102 +1 | No fix yet | — |
| Ubuntu 22.04 LTS | mozjs78 +2 | No fix yet | — |
| Ubuntu 20.04 LTS | mozjs52 +1 | No fix yet | — |
| Ubuntu 18.04 LTS | mozjs52 | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | MozillaThunderbird | 128.11.0-150200.8.221.1 | SUSE-SU-2025:01946-1 |
| SLES 15 SP6 | MozillaThunderbird | 128.11.0-150200.8.221.1 | SUSE-SU-2025:01946-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | firefox-esr +1 | 128.11.0-1.1 | openSUSE-SU-2025:15174-1, openSUSE-SU-2025:15170-1 |
| openSUSE Leap 15.6 | MozillaThunderbird | 128.11.0-150200.8.221.1 | SUSE-SU-2025:01946-1 |
Advisories 4
- WID-SEC-2025-1160 Mozilla Firefox und Thunderbird: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jun 10, 2026
- openSUSE-SU-2025:15174-1 MozillaThunderbird-128.11.0-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- openSUSE-SU-2025:15170-1 firefox-esr-128.11.0-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:01946-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Mar 23, 2026