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CVE-2026-100818 is a use-after-free vulnerability in Firefox's Widget: Gtk component that can enable escape from the browser sandbox. The issue is fixed in Firefox 157, Firefox ESR 153.4, and Firefox ESR 140.17.
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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.
9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A use-after-free vulnerability in Firefox's Widget: Gtk component that can enable sandbox escape.
A use-after-free vulnerability in Firefox's Widget: Gtk component that can enable sandbox escape. It has a CVSS v3.1 vector of AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H, indicating high confidentiality, integrity, and availability impact after user interaction.
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.