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CVE-2026-100777 is a use-after-free vulnerability in Mozilla Firefox's Graphics: Canvas2D component. The issue is fixed in Firefox 157, Firefox ESR 153.4, Firefox ESR 115.42, and Firefox ESR 140.17.
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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-reachable, high-severity vulnerability tracked as CVE-2026-100777, with a CVSS v3 vector of CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H. The content identifies Debian Linux versions 12.0, 13.0, and 14.0, including the Firefox ESR package, in the scanner detection context, but does not describe the underlying flaw or remediation.
A use-after-free vulnerability in Firefox's Graphics: Canvas2D 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.