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CVE-2026-84122 is a high-severity use-after-free vulnerability in the Mozilla Audio/Video component. The flaw affects releases prior to Firefox 155, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird ESR 140.15, and Thunderbird ESR 153.2. Use-after-free conditions can result in memory corruption when a previously freed object is accessed.
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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.
16 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability addressed by the referenced Fedora Firefox/NSS advisory; no flaw-specific description is supplied.
A vulnerability addressed by the referenced Fedora advisory; the content does not provide flaw-specific technical details.
A vulnerability tracked as CVE-2026-84122 affecting listed Ubuntu and Debian environments, including Mozilla JavaScript (mozjs) packages and Thunderbird/Firefox ESR packages. The content provides CVSS vectors but does not describe the underlying flaw type.
A use-after-free vulnerability in Firefox's Audio/Video component, fixed in Firefox 155, Firefox ESR 140.15, and Firefox ESR 153.2.
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.