CVE-2026-109722: Vulnerability in Mozilla Firefox
Description
JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
Affected software
Mozilla
Firefox
Mozilla
Thunderbird
pkg:github/mozilla/firefox-esrRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-109722 is a vulnerability involving JIT miscompilation in the JavaScript engine of Mozilla Firefox. The flaw could potentially lead to incorrect code execution due to the JIT compiler generating faulty machine code. Mozilla has released fixes for this vulnerability in Firefox 158, Firefox ESR 115.43, and Firefox ESR 153.5.
Potential Impact
The vulnerability could cause the JavaScript engine to miscompile code, potentially leading to unexpected behavior or security issues. However, there are no reports of active exploitation in the wild at this time.
Mitigation Recommendations
Users and administrators should update to Firefox 158, Firefox ESR 115.43, or Firefox ESR 153.5 or later to remediate this vulnerability. Applying these official fixes fully addresses the issue.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mozilla
- Date Reserved
- 2026-10-13T00:29:29.635Z
- State
- PUBLISHED
- Vendor Advisory Urls
- [{"url":"https://www.mozilla.org/security/advisories/mfsa2026-106/","vendor":"Mozilla"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-107/","vendor":"Mozilla"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-108/","vendor":"Mozilla"}]
Threat ID: 6ace2c462cdf04f65661d51e
Added to database: 10/13/2026, 13:04:06 UTC
Last enriched: 10/13/2026, 14:18:35 UTC
Last updated: 10/13/2026, 18:57:33 UTC
Views: 2
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