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CVE-2026-100769 is a use-after-free vulnerability in the JavaScript WebAssembly component of Mozilla Firefox and related Firefox ESR and Thunderbird releases. The flaw is fixed in Firefox 157, Firefox ESR 153.4 and 140.17, Thunderbird 157, Thunderbird 153.4, and Thunderbird 140.17. Use-after-free conditions can corrupt process memory during WebAssembly handling.
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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.
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 network-accessible vulnerability tracked as CVE-2026-100769, with high confidentiality, integrity, and availability impact under CVSS v3. Exploitation requires user interaction and has no known public exploits according to the notice.
A use-after-free vulnerability in Firefox's JavaScript WebAssembly 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.