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CVE-2026-84131 is a privilege-escalation vulnerability caused by invalid pointer handling in the Mozilla Graphics component. It affects Firefox and Firefox ESR releases before Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, and Firefox ESR 153.2, as well as corresponding affected Thunderbird releases before Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.
Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
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.
26 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability referenced in an Oracle Linux Firefox security update; no technical flaw description is provided.
A vulnerability addressed by the Fedora advisory; no technical flaw details are provided.
Vulnerability covered by a TencentOS Server 4 Mozilla Firefox package advisory.
A vulnerability included in a Debian Linux 12.0 Thunderbird localization-package security update; the supplied content provides no technical flaw description.
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.