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CVE-2026-84118

MediumPublished

Use-after-free in the JavaScript: GC component

Published: Sep 1, 2026
Updated: Sep 1, 2026
Assigning CNA: mozilla
Evidence observed: Sep 8, 2026

Primary CVSS

5.4/ 10Medium

nvd · CVSS 3.1

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

EPSS probability estimate

0.2%

Low · next 30 days

Percentile: 10.6%
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: GC component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155, and Thunderbird 153.2.

Sources

CVE-2026-84118-who-labeled-the-crit-as-a-highPoC
Proof-of-concept for CVE-2026-84118, a SpiderMonkey GC use-after-free leading to out-of-bounds read/write and potential code execution. Includes deterministic SEGV trigger and research on escalation to arbitrary read and ASLR defeat.

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