CVE-2026-2758

CVE-2026-2758 is a memory-safety use-after-free in the Mozilla Firefox JavaScript GC component. Public details show it affects Firefox and Thunderbird families and was fixed in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8. Multiple connected advisorie...

CVE-2026-2758

Use-after-free in the JavaScript: GC component. This vulnerability was fixed in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8...

PT-2026-21728

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 148 Thunderbird versions prior to 148 Description A use-after-free issue exists in the JavaScript: GC component. This condition can occur when memory is accessed after it has been freed, potentially leading to crashes...

PT-2026-21736

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 148 Thunderbird versions prior to 148 Description An information disclosure issue exists, along with a mitigation bypass, within the Settings UI component. Recommendations Update Firefox to version 148 or later. Updat...

PT-2026-21740

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 148 Thunderbird versions prior to 148 Description The software contains memory safety bugs. Some of these bugs exhibited evidence of memory corruption, and it is presumed that, with sufficient effort, they could...

PT-2026-21731

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 148 Thunderbird versions prior to 148 Description A use-after-free condition exists in the DOM Core and HTML components. This issue could allow for unexpected behavior or potential compromise. Recommendations Update...

PT-2026-21729

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 148 Thunderbird versions prior to 148 Description A JIT miscompilation issue exists in the JavaScript: WebAssembly component. JIT Just-In-Time compilation is a method used by browsers to improve execution speed by...

PT-2026-21714

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 148 Firefox ESR versions prior to 140.8 Thunderbird versions prior to 148 Thunderbird versions prior to 140.8 Description An integer overflow exists within the Libraries component of NSS. This issue may lead to...

PT-2026-21694

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 148 Firefox ESR versions prior to 115.33 Firefox ESR versions prior to 140.8 Thunderbird versions prior to 148 Thunderbird versions prior to 140.8 Description A sandbox escape issue exists in the Graphics: WebRender...

PT-2026-21725

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 148 Firefox ESR versions prior to 140.8 Thunderbird versions prior to 148 Thunderbird ESR versions prior to 140.8 Description The software contains memory safety bugs that exhibit evidence of memory corruption. It is...

PT-2026-21700

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 148 Firefox ESR versions prior to 140.8 Thunderbird versions prior to 148 Thunderbird versions prior to 140.8 Description A use-after-free issue exists in the JavaScript: WebAssembly component. This can potentially le...

PT-2026-21690

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 148 Firefox ESR versions prior to 115.33 Firefox ESR versions prior to 140.8 Thunderbird versions prior to 148 Thunderbird versions prior to 140.8 Description The issue involves incorrect boundary conditions within th...

PT-2026-21723

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 148 Firefox ESR versions prior to 140.8 Thunderbird versions prior to 148 Thunderbird versions prior to 140.8 Description A same-origin policy bypass exists in the Networking: JAR component. This allows potential...

PT-2026-21697

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 148 Firefox ESR versions prior to 115.33 Firefox ESR versions prior to 140.8 Thunderbird versions prior to 148 Thunderbird versions prior to 140.8 Description The software contains a flaw related to JIT miscompilation...

PT-2026-21705

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 148 Firefox ESR versions prior to 115.33 Firefox ESR versions prior to 140.8 Thunderbird versions prior to 148 Thunderbird versions prior to 140.8 Description A use-after-free issue exists in the Audio/Video: Playback...

PT-2026-21724

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 148 Firefox ESR versions prior to 140.8 Thunderbird versions prior to 148 Thunderbird versions prior to 140.8 Description A mitigation bypass exists in the Networking: Cache component. This issue may allow bypassing...

PT-2026-21708

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 148 Firefox ESR versions prior to 115.33 Firefox ESR versions prior to 140.8 Thunderbird versions prior to 148 Thunderbird versions prior to 140.8 Description A mitigation bypass exists in the DOM: HTML Parser...

PT-2026-21693

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 148 Firefox ESR versions prior to 115.33 Firefox ESR versions prior to 140.8 Thunderbird versions prior to 148 Thunderbird versions prior to 140.8 Description A sandbox escape is possible due to incorrect boundary...

PT-2026-21718

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 148 Firefox ESR versions prior to 140.8 Thunderbird versions prior to 148 Thunderbird versions prior to 140.8 Description The JavaScript Engine component contains an invalid pointer issue. Recommendations Update Firef...

PT-2026-21701

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 148 Firefox ESR versions prior to 140.8 Thunderbird versions prior to 148 Thunderbird versions prior to 140.8 Description A sandbox escape issue exists in the Storage: IndexedDB component. This allows a potential esca...