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CVE-2026-74936

CriticalPublished

Use-after-free in the JavaScript: WebAssembly component

Published: Aug 18, 2026
Updated: Aug 18, 2026
Assigning CNA: mozilla
Evidence observed: Aug 28, 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

0.4%

Low · next 30 days

Percentile: 34.3%
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

Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.

Sources

CVE-2026-74936-gc-potatoPoC
Reproduction of a WebAssembly use-after-free vulnerability in Mozilla's JavaScript engine, demonstrating a deterministic race condition and providing a controlled proof-of-concept.

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