Description
Integer overflow in the Widget: Win32 component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox | — | 140.11 |
| Mozilla | Thunderbird | — | 140.11 |
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 +3 | No fix yet | — |
| Ubuntu 20.04 LTS | mozjs52 +1 | No fix yet | — |
| Ubuntu 18.04 LTS | mozjs38 +1 | No fix yet | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 151.0.1-1.1 | openSUSE-SU-2026:10863-1 |
| openSUSE Tumbleweed | MozillaThunderbird | 140.11.1-1.1 | openSUSE-SU-2026:10864-1 |
| openSUSE Tumbleweed | firefox-esr | 140.11.0-1.1 | openSUSE-SU-2026:10813-1 |
| openSUSE Leap 16.0 | MozillaThunderbird | 140.12.0-bp160.1.1 | openSUSE-SU-2026:21168-1 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | firefox | 140.11-r0 | — |
Advisories 6
- WID-SEC-2026-2455 Oracle Solaris Drittanbieterkomponenten: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 27, 2026
- WID-SEC-2026-1606 Mozilla Firefox und Thunderbird: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jul 20, 2026
- openSUSE-SU-2026:21168-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Jun 30, 2026
- openSUSE-SU-2026:10863-1 MozillaFirefox-151.0.1-1.1 on GA media SUSE / openSUSE Security Updates · May 28, 2026
- openSUSE-SU-2026:10864-1 MozillaThunderbird-140.11.1-1.1 on GA media SUSE / openSUSE Security Updates · May 28, 2026
- openSUSE-SU-2026:10813-1 firefox-esr-140.11.0-1.1 on GA media SUSE / openSUSE Security Updates · May 20, 2026