Summary
generated automatically from NVD dataCVE-2026-74936 is a use-after-free flaw (CWE-416) in the JavaScript: WebAssembly component affecting Mozilla Firefox and Thunderbird. The NVD description states it was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1. It is rated CRITICAL with a CVSS v3.1 score of 9.8, with a network attack vector, low complexity, no privileges and no user interaction required.
NVD description
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.
EPSS · FIRST.org
0.59%probability of exploitation in the next 30 days
Higher than 47% of scored CVEs
EPSS (Exploit Prediction Scoring System) estimates, from observed exploitation activity, how likely a CVE is to be exploited in the next 30 days. It complements CVSS, which measures severity, not likelihood. Score of 2026-10-19, recomputed daily by FIRST.org.
In-depth analysis on cveo.tech
We've published a detailed analysis of this CVE — exploitation, IOCs and mitigation.
CVSS v3.1 Score
Information
- Published
- 18 août 2026
- Updated
- 21 août 2026
- Status
- Modified
- Source
- security@mozilla.org
Affected products
Weaknesses (CWE)
References (7)
- https://bugzilla.mozilla.org/show_bug.cgi?id=2052688Permissions Required
- https://www.mozilla.org/security/advisories/mfsa2026-74/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-76/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-77/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-78/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-79/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-80/Vendor Advisory
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