CVE-2026-74936 Use-after-free in the JavaScript: WebAssembly component

Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1...

CVE-2026-74934 Site isolation issue in the Graphics: CanvasWebGL component

Site isolation issue in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1...

CVE-2026-74935

Privilege escalation in the DOM: Networking component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1...

CVE-2026-74934

Site isolation issue in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1...

CVE-2026-74935 Privilege escalation in the DOM: Networking component

Privilege escalation in the DOM: Networking component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1...

CVE-2026-74936

Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1...

MiracleLinux 8 : firefox-140.13.0-1.el8_10.ML.1 (AXSA:2026-1560:19)

The remote MiracleLinux 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the AXSA:2026-1560:19 advisory. libaom: libaom: heap buffer overflow in AV1 encoder first-pass stats buffer via LAP mode CVE-2026-56208 firefox: thunderbird: Site isolation issue i...

Security Vulnerabilities fixed in Thunderbird 154 — Mozilla

Internally found bugs present in Thunderbird ESR 140.13, Thunderbird ESR 153.0 and Thunderbird 153. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. Internally found bugs...

Security Vulnerabilities fixed in Thunderbird 153.1 — Mozilla

Internally found bugs present in Thunderbird ESR 140.13, Thunderbird ESR 153.0 and Thunderbird 153. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. Internally found bugs...

KLA91232 Multiple vulnerabilities in Mozilla Thunderbird ESR

Multiple vulnerabilities were found in Mozilla Thunderbird ESR. Malicious users can exploit these vulnerabilities to bypass security restrictions, cause denial of service, execute arbitrary code, obtain sensitive information. Below is a complete list of vulnerabilities: 1. Security vulnerability...

KLA91229 Multiple vulnerabilities in Mozilla Thunderbird

Multiple vulnerabilities were found in Mozilla Thunderbird. Malicious users can exploit these vulnerabilities to bypass security restrictions, cause denial of service, execute arbitrary code, obtain sensitive information. Below is a complete list of vulnerabilities: 1. Security vulnerability in t...

Security Vulnerabilities fixed in Thunderbird 140.14 — Mozilla

Internally found bugs present in Thunderbird ESR 140.13, Thunderbird ESR 153.0 and Thunderbird 153. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. Internally found bugs...

KLA91231 Multiple vulnerabilities in Mozilla Thunderbird ESR

Multiple vulnerabilities were found in Mozilla Thunderbird ESR. Malicious users can exploit these vulnerabilities to bypass security restrictions, cause denial of service, execute arbitrary code, obtain sensitive information. Below is a complete list of vulnerabilities: 1. Security vulnerability...

MiracleLinux 8 : thunderbird-140.13.0-1.el8_10.ML.1 (AXSA:2026-1547:18)

The remote MiracleLinux 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the AXSA:2026-1547:18 advisory. firefox: thunderbird: Site isolation issue in the DOM: Navigation component CVE-2026-15719 firefox: thunderbird: Invalid pointer in the JavaScript:...

Unity Linux 20.1050a / 20.1060a / 20.1070a Security Update: thunderbird (UTSA-2026-101110)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-101110 advisory. Incorrect boundary conditions in the Graphics component. This vulnerability was fixed in Firefox 147, Firefox ESR 115.32, Firefox ESR 140.7, Thunderbird 147, and...

Unity Linux 20.1050a / 20.1060a / 20.1070a Security Update: thunderbird (UTSA-2026-100877)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-100877 advisory. When a file download is specified via the Content-Disposition header, that directive would be ignored if the file was included via a or tag, potentially making a...

firefox: thunderbird: Sandbox escape due to use-after-free in the DOM: Navigation component

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Sandbox escape due to use-after-free in the DOM: Navigation component...

firefox: thunderbird: Mitigation bypass in the Enterprise Policies component

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Mitigation bypass in the Enterprise Policies component...

firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 140.13 and Firefox 153

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Memory safety bugs present in Thunderbird ESR 140.12 and Thunderbird 152. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of...

firefox: thunderbird: Information disclosure in the Framework component in DevTools

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Information disclosure in the Framework component in DevTools...