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CVE-2026-100789 is a use-after-free vulnerability in Mozilla Firefox's Graphics: Canvas2D component. Incorrect lifetime management of Canvas2D-related memory can result in memory corruption in the affected Firefox process. The issue is fixed in Firefox 157, Firefox ESR 153.4, Firefox ESR 115.42, and Firefox ESR 140.17.
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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 remotely accessible, low-complexity vulnerability requiring user interaction, with high potential impact to confidentiality, integrity, and availability according to the supplied CVSS v3 vector. The content identifies Debian Linux 12.0, 13.0, and 14.0 and Firefox ESR in its CPE information, but does not describe the underlying flaw or attack mechanism.
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.