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CVE-2026-8388

HighPublished

Incorrect boundary conditions in the JavaScript Engine: JIT component

Published: May 12, 2026
Updated: Jul 15, 2026
Assigning CNA: mozilla
Evidence observed: Aug 8, 2026

Primary CVSS

7.5/ 10High

nvd · CVSS 3.1

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

EPSS probability estimate

0.2%

Low · next 30 days

Percentile: 15.8%
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

Incorrect boundary conditions in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 150.0.3, Firefox ESR 115.36, Firefox ESR 140.11, and Thunderbird 140.11.

Sources

CVE-2026-8388-Mitigation-and-DetectionInformational
Provides mitigation and detection guidance for CVE-2026-8388, including indicators of compromise and remediation steps for security teams.

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