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CVE-2026-2764

CriticalPublished

JIT miscompilation, use-after-free in the JavaScript Engine: JIT component

Published: Feb 24, 2026
Updated: Jul 15, 2026
Assigning CNA: mozilla
Evidence observed: Aug 11, 2026

Primary CVSS

9.8/ 10Critical

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS probability estimate

0.5%

Low · next 30 days

Percentile: 39.7%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

JIT miscompilation, use-after-free in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.

Sources

CVE-2026-2764-but-with-wasmExploit
Proof-of-concept exploit chain for Firefox JIT CVE-2026-2764, chaining JIT miscompilation and use-after-free into arbitrary read/write and WASM shellcode execution.

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