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CVE-2026-6757 is a memory-safety flaw in the JavaScript WebAssembly component of Mozilla Firefox and Thunderbird. The available context describes the issue as an invalid pointer condition, with supporting material further characterizing it as CWE-824 involving access to an uninitialized or otherwise invalid pointer during processing of crafted WebAssembly content. The vulnerable condition can be triggered while compiling or executing malformed or edge-case WebAssembly bytecode, leading to undefined behavior and memory corruption in the browser or mail client process. Mozilla states the issue was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
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No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
16 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A standalone Firefox security vulnerability credited to Anthropic’s Frontier Red Team and fixed as part of Mozilla’s April 2026 security work.
A medium-severity Firefox vulnerability fixed in Firefox 150 and specifically attributed in the article to discovery assistance from Anthropic's Claude AI.
An invalid pointer / memory corruption vulnerability in the JavaScript WebAssembly component of Mozilla Firefox and Thunderbird that can be triggered by crafted WebAssembly content, potentially leading to code execution, information disclosure, or crashes.
A medium-severity Firefox vulnerability fixed in Firefox 150 and specifically credited to Anthropic's Claude AI discovery efforts.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.