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CVE-2025-14324 is a JIT miscompilation vulnerability in the Mozilla JavaScript Engine affecting Firefox, Firefox ESR, and Thunderbird. The flaw resides in the JIT component, where JavaScript code can be incorrectly optimized or compiled, causing the engine to execute logic that diverges from intended semantics. In browser and mail-client rendering contexts, JIT miscompilation flaws are security-relevant because attacker-controlled script can potentially trigger unsafe states that undermine memory safety or security boundaries. Mozilla fixed this issue in Firefox 146, Firefox ESR 115.31, Firefox ESR 140.6, Thunderbird 146, and Thunderbird 140.6.
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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.
20 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A just-in-time (JIT) miscompilation vulnerability in the JavaScript Engine of Mozilla products, potentially leading to arbitrary code execution.
A JIT miscompilation vulnerability in the JavaScript Engine: JIT component of Firefox, which could potentially lead to code execution or other unexpected behavior.
A JIT miscompilation vulnerability in the JavaScript Engine: JIT component of Firefox ESR, which could potentially lead to code execution or other unexpected behavior.
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.