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CVE-2024-8381

CriticalPublished

A potentially exploitable type confusion could be triggered when looking up a property name on an object being used as the with environment. This...

Published: Sep 3, 2024
Updated: Nov 4, 2025
Assigning CNA: mozilla
Evidence observed: Aug 8, 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

4.4%

Low · next 30 days

Percentile: 90.9%
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

A potentially exploitable type confusion could be triggered when looking up a property name on an object being used as the `with` environment. This vulnerability affects Firefox < 130, Firefox ESR < 128.2, Firefox ESR < 115.15, Thunderbird < 128.2, and Thunderbird < 115.15.

Sources

CVE-2024-8381Exploit
CVE-2024-8381: A SpiderMonkey Interpreter Type Confusion Bug.

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