JIT Miscompilation in Firefox JavaScript Engine
CVE-2026-100793

Currently unrated

Key Information:

Vendor: Mozilla
Status: Firefox
Vendor: CVE Published:; 29 September 2026

What is CVE-2026-100793?

A vulnerability exists in the JavaScript Engine of Firefox, specifically related to JIT compilation. This flaw could potentially lead to unexpected behavior or exploitation opportunities within the browser environment. Mozilla has addressed this issue in Firefox version 157, underscoring the importance of keeping your software updated to mitigate the risk of this vulnerability.

Affected Version(s)

Firefox 157

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2073268

https://www.mozilla.org/security/advisories/mfsa2026-97/

Download the Critical Vulnerability Management Cheat Sheet

Timeline

Vulnerability published
Sep 29, 2026
Vulnerability Reserved
Sep 26, 2026

Credit

Amy Burnett of OpenAI

CVE-2026-100793 Data

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