CVE-2026-100788: Access of Uninitialized Pointer

Invalid pointer in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, and Firefox ESR 140.17...

CVE-2026-100792: Access of Resource Using Incompatible Type

JIT miscompilation in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, and Firefox ESR 140.17...

CVE-2026-100818: Use After Free

Sandbox escape due to use-after-free in the Widget: Gtk component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, and Firefox ESR 140.17...

PT-2026-102574

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 157 Firefox ESR versions prior to 153.4 Thunderbird versions prior to 157 Description A use-after-free issue exists in the Disability Access APIs component, which could allow a sandbox escape. A use-after-free occurs...

CVE-2026-100811: Use After Free

Sandbox escape due to use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, and Firefox ESR 140.17...

PT-2026-102591

Other issue in the JavaScript: WebAssembly component. This vulnerability was fixed in Thunderbird 157 and Firefox 157...

PT-2026-102532

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 157 Firefox ESR versions prior to 115.42 Firefox ESR versions prior to 140.17 Firefox ESR versions prior to 153.4 Thunderbird versions prior to 157 Description A sandbox escape exists within the DOM Navigation...

CVE-2026-100795: Allocation of Resources Without Limits or Throttling

Denial-of-service in the Networking component. This vulnerability was fixed in Thunderbird 157 and Firefox 157...

PT-2026-102535

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 157 Thunderbird versions prior to 157 Description A use-after-free issue exists in the Graphics: WebGPU component, which can lead to privilege escalation. Use-after-free is a memory corruption flaw that occurs when an...

CVE-2026-100756: Improper Restriction of Operations within the Bounds of a Memory Buffer

Incorrect boundary conditions in the Audio/Video: Playback component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17...

CVE-2026-100794: Improper Restriction of Operations within the Bounds of a Memory Buffer

Sandbox escape due to incorrect boundary conditions in the Internationalization component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, and Firefox ESR 140.17...

PT-2026-102571

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 157 Firefox ESR versions prior to 115.42 Firefox ESR versions prior to 140.17 Firefox ESR versions prior to 153.4 Thunderbird versions prior to 157 Description Privilege escalation is possible due to a use-after-free...

ALSA-2026:73130 Important: thunderbird security update

Mozilla Thunderbird is a standalone mail and newsgroup client. Security Fixes: firefox: thunderbird: Privilege escalation in the DOM: Workers component CVE-2026-16365 firefox: thunderbird: Sandbox escape in the Remote Settings Client component CVE-2026-75874 firefox: Sandbox escape due to...

MiracleLinux 8 : firefox-140.15.0-1.el8_10.ML.1 (AXSA:2026-1932:24)

The remote MiracleLinux 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the AXSA:2026-1932:24 advisory. firefox: thunderbird: Privilege escalation in the DOM: Workers component CVE-2026-16365 firefox: thunderbird: Sandbox escape in the Remote Settings...

RHEL 10 : thunderbird (RHSA-2026:73130)

The remote Redhat Enterprise Linux 10 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2026:73130 advisory. Mozilla Thunderbird is a standalone mail and newsgroup client. Security Fixes: firefox: thunderbird: Privilege escalation in the DOM:...

Oracle Linux 10 : thunderbird (ELSA-2026-73130)

The remote Oracle Linux 10 host has a package installed that is affected by multiple vulnerabilities as referenced in the ELSA-2026-73130 advisory. 140.16.0-1.0.1 - Add Oracle prefs 140.16.0-1 - Update to 140.16.0 ESR 140.15.0-1 - Update to 140.15.0 ESR - Fix ML-DSA certificate validation Resolve...

Amazon Linux 2 : thunderbird (ALAS-2026-3952)

The version of thunderbird installed on the remote host is prior to 140.16.0-1. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2026-3952 advisory. Triggering an error condition in certain MIME bodies would cause uninitialized memory to be used. This vulnerabilit...

PT-2026-102605

Name of the Vulnerable Software and Affected Versions Firefox ESR versions prior to 115.42 Firefox ESR versions prior to 140.17 Firefox ESR versions prior to 153.4 Thunderbird versions prior to 140.17 Thunderbird versions prior to 153.4 Description A use-after-free issue exists in the Graphics:...

PT-2026-102553

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 157 Firefox ESR versions prior to 115.42 Firefox ESR versions prior to 140.17 Firefox ESR versions prior to 153.4 Thunderbird versions prior to 157 Description A use-after-free issue exists in the XSLT component...

Important: thunderbird

Issue Overview: Triggering an error condition in certain MIME bodies would cause uninitialized memory to be used. This vulnerability was fixed in Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2. CVE-2026-84639 A maliciously constructed mail header could lead to a one byte read past the...