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CVE-2026-100772 is a use-after-free vulnerability in the DOM: Core & HTML component of Mozilla Firefox. The flaw is fixed in Firefox 157, Firefox ESR 153.4, and Firefox ESR 140.17. A use-after-free condition can corrupt memory in the affected Firefox process and may potentially permit arbitrary code execution in that process.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
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.
14 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A newly published, remotely reachable vulnerability tracked as CVE-2026-100772, identified by an unpatched-vulnerability plugin for Debian Linux 12.0, 13.0, and 14.0, with Firefox ESR also listed in the CPE information. The supplied CVSS v3.0 vector indicates low attack complexity, no privileges required, user interaction required, and high confidentiality, integrity, and availability impact.
A use-after-free vulnerability in Firefox's DOM: Core & HTML component.
Mozilla Firefox vulnerability addressed by the Firefox 157.0 advisory; no individual technical details are provided.
A Mozilla Firefox vulnerability referenced by the Firefox 157.0 security update; no technical flaw details are supplied.
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.