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CVE-2026-100786 is a use-after-free vulnerability in the Mozilla Firefox Graphics component that can enable escape from the Firefox sandbox. It affects versions prior to Firefox 157, Firefox ESR 153.4, Firefox ESR 115.42, and Firefox ESR 140.17.
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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.
15 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A high-severity vulnerability identified as CVE-2026-100786, with a CVSS v3 vector of CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H. The supplied plugin metadata associates it with Debian Linux 12.0, 13.0, and 14.0, including Firefox ESR package context.
A use-after-free vulnerability in Firefox's Graphics component that can allow a sandbox escape.
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.