Product · Mozilla

Thunderbird

1,814 known vulnerabilities.

All Critical High Medium Low Exploited only Public exploit

1,814 results · Feed

High 8.8

CVE-2026-117974

Use-after-free in the XML component

Use-after-free in the XML component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.

Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu

Oct 27, 2026
High 8.8

CVE-2026-117973

Use-after-free in the Networking: DNS component

Use-after-free in the Networking: DNS component. This vulnerability was fixed in Firefox 159, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.

Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu

Oct 27, 2026
High 8.8

CVE-2026-117972

Use-after-free in the Graphics component

Use-after-free in the Graphics component. This vulnerability was fixed in Firefox 159, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.

Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu

Oct 27, 2026
Critical 9.6

CVE-2026-117971

Sandbox escape due to use-after-free in the Print Preview component

Sandbox escape due to use-after-free in the Print Preview component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.

Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu

Oct 27, 2026
High 8.8

CVE-2026-117970

Race condition in the Disability Access APIs component

Race condition in the Disability Access APIs component. This vulnerability was fixed in Firefox 159, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.

Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu

Oct 27, 2026
High 8.8

CVE-2026-117969

Invalid pointer in the JavaScript Engine: JIT component

Invalid pointer in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 159, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.

Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu

Oct 27, 2026
High 8.8

CVE-2026-117968

Use-after-free in the DOM: Core & HTML component

Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.

Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu

Oct 27, 2026
High 8.8

CVE-2026-117967

Mitigation bypass in the DOM: Security component

Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 159, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.

Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu

Oct 27, 2026
High 8.1

CVE-2026-117966

Site isolation issue in the Networking: HTTP component

Site isolation issue in the Networking: HTTP component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.

Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu

Oct 27, 2026
High 8.1

CVE-2026-117965

Same-origin policy bypass in the Address Bar component

Same-origin policy bypass in the Address Bar component. This vulnerability was fixed in Firefox 159, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.

Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu

Oct 27, 2026
High 8.8

CVE-2026-117964

Use-after-free in the Panning and Zooming component

Use-after-free in the Panning and Zooming component. This vulnerability was fixed in Firefox 159, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.

Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu

Oct 27, 2026
High 8.1

CVE-2026-117963

Incorrect boundary conditions in the DOM: Service Workers component

Incorrect boundary conditions in the DOM: Service Workers component. This vulnerability was fixed in Firefox 159, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.

Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu

Oct 27, 2026
Critical 9.6

CVE-2026-117962

Sandbox escape due to incorrect boundary conditions in the Storage: Quota Manager component

Sandbox escape due to incorrect boundary conditions in the Storage: Quota Manager component. This vulnerability was fixed in Firefox 159, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.

Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu

Oct 27, 2026
High 8.1

CVE-2026-117961

Incorrect boundary conditions in the Layout: Text and Fonts component

Incorrect boundary conditions in the Layout: Text and Fonts component. This vulnerability was fixed in Firefox 159, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.

Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu

Oct 27, 2026
Medium 4.7

CVE-2026-117960

Spoofing issue in the DOM: Core & HTML component

Spoofing issue in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 159, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.

Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu

Oct 27, 2026
High 8.1

CVE-2026-117959

Site isolation issue in the DOM: Service Workers component

Site isolation issue in the DOM: Service Workers component. This vulnerability was fixed in Firefox 159, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.

Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu

Oct 27, 2026
High 8.1

CVE-2026-117958

Site isolation issue in the Networking: HTTP component

Site isolation issue in the Networking: HTTP component. This vulnerability was fixed in Firefox 159, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.

Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu

Oct 27, 2026
High 8.1

CVE-2026-117957

Cryptographic issue in the WebRTC: Networking component

Cryptographic issue in the WebRTC: Networking component. This vulnerability was fixed in Firefox 159, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.

Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu

Oct 27, 2026
High 8.8

CVE-2026-117956

Invalid pointer in the Nimbus Desktop Client component

Invalid pointer in the Nimbus Desktop Client component. This vulnerability was fixed in Firefox 159, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.

Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu

Oct 27, 2026
High 8.1

CVE-2026-117955

JIT miscompilation in the JavaScript: WebAssembly component

JIT miscompilation in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 159, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.

Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu

Oct 27, 2026
High 8.8

CVE-2026-117954

Use-after-free in the Layout: Positioned component

Use-after-free in the Layout: Positioned component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.

Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu

Oct 27, 2026
High 8.8

CVE-2026-117953

Use-after-free in the DOM: Core & HTML component

Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 159, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.

Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu

Oct 27, 2026
High 8.1

CVE-2026-117952

Uninitialized memory in the Networking component

Uninitialized memory in the Networking component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.

Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu

Oct 27, 2026
High 8.8

CVE-2026-117951

Use-after-free in the DOM: Core & HTML component

Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.

Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu

Oct 27, 2026
High 8.8

CVE-2026-117950

Incorrect boundary conditions in the DOM: Core & HTML component

Incorrect boundary conditions in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.

Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu

Oct 27, 2026
High 8.8

CVE-2026-117949

Use-after-free in the DOM: Core & HTML component

Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.

Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu

Oct 27, 2026
Medium 6.3

CVE-2026-117948

Use-after-free in the SVG component

Use-after-free in the SVG component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.

Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu

Oct 27, 2026
Medium 6.3

CVE-2026-117947

Use-after-free in the XML component

Use-after-free in the XML component. This vulnerability was fixed in Firefox 159, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.

Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu

Oct 27, 2026
Critical 9.8

CVE-2026-117946

Incorrect boundary conditions in the JavaScript Engine component

Incorrect boundary conditions in the JavaScript Engine component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.

Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu

Oct 27, 2026
Critical 9.8

CVE-2026-117945

Incorrect boundary conditions in the XML component

Incorrect boundary conditions in the XML component. This vulnerability was fixed in Firefox 159, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.

Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu

Oct 27, 2026
Medium 6.3

CVE-2026-117944

Use-after-free in the Layout component

Use-after-free in the Layout component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.

Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu

Oct 27, 2026
High 8.8

CVE-2026-117943

Use-after-free in the DOM: Core & HTML component

Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.

Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu

Oct 27, 2026
High 8.8

CVE-2026-117940

Use-after-free in the DOM: Core & HTML component

Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 159, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.

Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu

Oct 27, 2026
High 7.3

CVE-2026-117942

Incorrect boundary conditions in the JavaScript Engine: JIT component

Incorrect boundary conditions in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.

Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu

Oct 27, 2026
High 8.8

CVE-2026-117941

Use-after-free in the DOM: CSS Object Model component

Use-after-free in the DOM: CSS Object Model component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.

Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu

Oct 27, 2026
High 7.3

CVE-2026-117937

Invalid pointer in the JavaScript Engine component

Invalid pointer in the JavaScript Engine component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.

Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu

Oct 27, 2026
Medium 6.3

CVE-2026-117939

Use-after-free in the XML component

Use-after-free in the XML component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.

Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu

Oct 27, 2026
Medium 6.3

CVE-2026-117938

Use-after-free in the Layout component

Use-after-free in the Layout component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.

Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu

Oct 27, 2026
High 8.8

CVE-2026-117936

Use-after-free in the DOM: Core & HTML component

Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.

Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu

Oct 27, 2026
Medium 6.3

CVE-2026-117935

Use-after-free in the DOM: Bindings (WebIDL) component

Use-after-free in the DOM: Bindings (WebIDL) component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.

Mozilla Firefox Thunderbird thunderbird Browsers Debian Ubuntu

Oct 27, 2026