firefox: thunderbird: Invalid pointer in the JavaScript: WebAssembly component

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Invalid pointer in the JavaScript: WebAssembly component...

CVE-2026-8257

The CVE affects WebAssembly Binaryen up to 117, specifically the BrOn Parser component’s IRBuilder::makeBrOn in src/wasm/wasm-ir-builder.cpp. A reachable assertion can be triggered by manipulation in this function. Local attack vector; the exploit is public and may be used. A patch exists (hash: ...

CVE-2026-8257 WebAssembly Binaryen BrOn wasm-ir-builder.cpp makeBrOn assertion

A vulnerability was detected in WebAssembly Binaryen up to 117. This issue affects the function IRBuilder::makeBrOn of the file src/wasm/wasm-ir-builder.cpp of the component BrOn Parser. Performing a manipulation results in reachable assertion. The attack needs to be approached locally. The explo...

CVE-2026-8257

A vulnerability was detected in WebAssembly Binaryen up to 117. This issue affects the function IRBuilder::makeBrOn of the file src/wasm/wasm-ir-builder.cpp of the component BrOn Parser. Performing a manipulation results in reachable assertion. The attack needs to be approached locally. The explo...

CVE-2026-8257 WebAssembly Binaryen BrOn wasm-ir-builder.cpp makeBrOn assertion

A vulnerability was detected in WebAssembly Binaryen up to 117. This issue affects the function IRBuilder::makeBrOn of the file src/wasm/wasm-ir-builder.cpp of the component BrOn Parser. Performing a manipulation results in reachable assertion. The attack needs to be approached locally. The explo...

ALSA-2026:15892 Important: thunderbird security update

Mozilla Thunderbird is a standalone mail and newsgroup client. Security Fixes: firefox: thunderbird: Incorrect boundary conditions in the Libraries component in NSS CVE-2026-6772 firefox: thunderbird: Use-after-free in the JavaScript Engine component CVE-2026-6754 firefox: thunderbird: Spoofing...

PT-2026-39550

Name of the Vulnerable Software and Affected Versions WebAssembly Binaryen versions prior to 118 Description An issue exists in the BrOn Parser component within the IRBuilder::makeBrOn function of the src/wasm/wasm-ir-builder.cpp file. A specific manipulation can lead to a reachable assertion,...

Important: thunderbird security update

Mozilla Thunderbird is a standalone mail and newsgroup client. Security Fixes: firefox: thunderbird: Incorrect boundary conditions in the Libraries component in NSS CVE-2026-6772 firefox: thunderbird: Use-after-free in the JavaScript Engine component CVE-2026-6754 firefox: thunderbird: Spoofing...

Linux Distros Unpatched Vulnerability : CVE-2026-8257

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - A vulnerability was detected in WebAssembly Binaryen up to 117. This issue affects the function IRBuilder::makeBrOn of the file src/wasm/wasm-ir-builder.cpp of...

Updated thunderbird packages fix security vulnerabilities

Use-after-free in the DOM: Core & HTML component. CVE-2026-6746 Use-after-free in the WebRTC component. CVE-2026-6747 Uninitialized memory in the Audio/Video: Web Codecs component. CVE-2026-6748 Information disclosure due to uninitialized memory in the Graphics: Canvas2D component. CVE-2026-6749...

Exploit for Out-of-bounds Write in Google Chrome

Exploitation of CVE-2021-21220 From Incorrect JIT Behavior...

RLSA-2026:12285 Important: thunderbird security update

Mozilla Thunderbird is a standalone mail and newsgroup client. Security Fixes: firefox: thunderbird: Incorrect boundary conditions in the Libraries component in NSS CVE-2026-6772 firefox: thunderbird: Use-after-free in the JavaScript Engine component CVE-2026-6754 firefox: thunderbird: Spoofing...

SUSE-SU-2026:1741-1 Security update for MozillaThunderbird

This update for MozillaThunderbird fixes the following issues Updated to Mozilla Thunderbird 140.10.1: MFSA 2026-34 bsc1262230: - CVE-2026-6746: Use-after-free in the DOM: Core & HTML component. - CVE-2026-6747: Use-after-free in the WebRTC component. - CVE-2026-6748: Uninitialized memory in the...

RockyLinux 10 : thunderbird (RLSA-2026:12285)

The remote RockyLinux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:12285 advisory. firefox: thunderbird: Incorrect boundary conditions in the Libraries component in NSS CVE-2026-6772 firefox: thunderbird: Use-after-free in the...

VM2 Has a WASM Sandbox Escape

Summary Full sandbox escape with arbitrary code execution. Attacker code inside VM.run obtains host process object and runs host commands with zero host cooperation. Details Confirmed on: vm2 3.10.4, Node.js v25.6.1 x64 Linux Trigger: Attacker-controlled code passed to VM.run Requires: Node.js...

firefox: thunderbird: Invalid pointer in the JavaScript: WebAssembly component

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Invalid pointer in the JavaScript: WebAssembly component...

ALSA-2026:13537 Important: thunderbird security update

Mozilla Thunderbird is a standalone mail and newsgroup client. Security Fixes: firefox: thunderbird: Incorrect boundary conditions in the Libraries component in NSS CVE-2026-6772 firefox: thunderbird: Use-after-free in the JavaScript Engine component CVE-2026-6754 firefox: thunderbird: Spoofing...

RHEL 8 : thunderbird (RHSA-2026:13537)

The remote Redhat Enterprise Linux 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2026:13537 advisory. Mozilla Thunderbird is a standalone mail and newsgroup client. Security Fixes: firefox: thunderbird: Incorrect boundary conditions in the...

Important: thunderbird security update

Mozilla Thunderbird is a standalone mail and newsgroup client. Security Fixes: firefox: thunderbird: Incorrect boundary conditions in the Libraries component in NSS CVE-2026-6772 firefox: thunderbird: Use-after-free in the JavaScript Engine component CVE-2026-6754 firefox: thunderbird: Spoofing...

Astra Linux – Vulnerability in Firefox, Thunderbird

Inconsistent data in the instruction and data cache when creating Wasm code can lead to a potentially exploitable crash.This bug only affects Firefox on ARM64 platforms.. This vulnerability affects Firefox ESR 102.3, Thunderbird 102.3, and Firefox 105...