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CVE-2026-100767 is a use-after-free vulnerability in the Networking: Cache component of Mozilla Firefox. The flaw affects Firefox releases before the available fixes, including Firefox 157 and Firefox ESR 153.4, 115.42, and 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.
14 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A network-accessible vulnerability with low attack complexity and no required privileges, requiring user interaction, with high confidentiality, integrity, and availability impact under CVSS v3. The notice identifies Debian Linux 12.0, 13.0, and 14.0, including Firefox ESR package context, as affected inventory scope.
A use-after-free vulnerability in Firefox's Networking: Cache 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.