CVE-2026-4698 - Vulnerability Analysis

Overview

Firefox < 149, Firefox ESR < 115.34, and Firefox ESR < 140.9 contain a JIT miscompilation vulnerability in the JavaScript Engine, letting attackers cause incorrect code execution or crashes, exploit requires crafted JavaScript code.

Severity & Score

Impact

Attackers can cause incorrect code execution or crashes, potentially leading to denial of service or code execution.

Mitigation

Update to Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9 or later.

References

• https://www.mozilla.org/security/advisories/mfsa2026-21/
• https://www.mozilla.org/security/advisories/mfsa2026-22/
• https://www.mozilla.org/security/advisories/mfsa2026-23/
• https://www.mozilla.org/security/advisories/mfsa2026-24/
• https://bugzilla.mozilla.org/show_bug.cgi?id=2020906
• https://www.mozilla.org/security/advisories/mfsa2026-20/

Social Media Activity(1 post)

Yazoul - Cybersecurity Alerts

@Matchbook3469

Mar 26, 2026

🔴 New security advisory: CVE-2026-4698 affects Mozilla Firefox. • Impact: Remote code execution or complete system compromise possible • Risk: Attackers can gain full control of affected systems • Mitigation: Patch immediately or isolate affected systems Full breakdown: https://www.yazoul.net/advisory/cve/cve-2026-4698-firefox-jit-compiler-vulnerability #Cybersecurity #ZeroDay #ThreatIntel

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