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CVE-2026-100791 is a use-after-free vulnerability in Mozilla Firefox's DOM: Core & HTML component. It affects Firefox builds prior to Firefox 157, Firefox ESR 153.4, Firefox ESR 115.42, and Firefox ESR 140.17. The memory-safety flaw may result in memory corruption and could potentially enable arbitrary code execution in the Firefox process context.
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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.
14 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A network-accessible vulnerability with low attack complexity and no required privileges, requiring user interaction, affecting Debian Linux 12.0, 13.0, and 14.0 according to the plugin metadata. The CVSS v3 vector indicates potential high confidentiality, integrity, and availability impact. The specific underlying vulnerable component and technical flaw are not identified in the supplied content.
A use-after-free vulnerability in Firefox's DOM Core & HTML component.
A vulnerability addressed by a Slackware Mozilla Firefox package update; no technical vulnerability details are provided.
A Mozilla Firefox ESR vulnerability referenced by the plugin; no technical details are provided.
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.