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CVE-2026-6746 is a use-after-free vulnerability in the DOM: Core & HTML component affecting Mozilla Firefox and Thunderbird. The provided content identifies it as a high-severity, high-impact DOM use-after-free issue. A use-after-free condition indicates that memory associated with a DOM/Core HTML object can be freed while still being referenced later, creating a stale pointer dereference condition. This can result in memory corruption during normal browser or mail-client content processing. The issue was fixed in Firefox 150, Firefox ESR 115.35, 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.
No public exploits tracked yet. Mallory keeps watching.
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.
18 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 high-severity Firefox vulnerability fixed in Firefox 150 and specifically attributed in the article to discovery assistance from Anthropic's Claude AI.
A high-severity Firefox vulnerability fixed in Firefox 150 and specifically credited to Anthropic's Claude AI discovery efforts.
A high-impact DOM use-after-free vulnerability in Firefox 150 called out in Mozilla’s advisory.
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.