CVE-2026-6786

Memory safety bugs present in Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and Thunderbird 149. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in...

EUVD-2026-14806

Use-after-free in the CSS Parsing and Computation component. This vulnerability affects Firefox 149, Firefox ESR 115.34, and Firefox ESR 140.9...

CVE-2026-4719

Incorrect boundary conditions in the Graphics: Text component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9...

CVE-2026-4688

Sandbox escape due to use-after-free in the Disability Access APIs component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9...

CVE-2026-4720 Memory safety bugs fixed in Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and Thunderbird 149

Memory safety bugs present in Firefox ESR 140.8, Thunderbird ESR 140.8, Firefox 148 and Thunderbird 148. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in...

CVE-2026-4711

Use-after-free in the Widget: Cocoa component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9...

CVE-2026-4722

Privilege escalation in the IPC component. This vulnerability was fixed in Firefox 149 and Thunderbird 149...

CVE-2026-4684

CVE-2026-4684 describes a race condition leading to a use-after-free in the Graphics: WebRender component. Affected products/versions are Firefox < 149, Firefox ESR < 115.34, and Firefox ESR

PT-2026-27419

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 149 Firefox ESR versions 115.33 through 140.8 Thunderbird versions prior to 149 Thunderbird ESR versions 140.8 through 140.9 Description The software contains memory safety bugs, some of which demonstrate evidence of...