Quickfire Cyber Bulletin June 5, 2026
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CVE-2026-4698

Low

Description

JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

Scores & Signals

CVSS 3.1 9.8 — CRITICAL
EPSS score 0.0005 (14.4th percentile)
CISA KEV No
Affected Mozilla Firefox
Published 2026-03-24

Sources

External references

Risk scores are deterministic, based on public signals only. They are informational context, not a final verdict. Always consult vendor advisories before taking action.