CVE-2026-109757: Vulnerability in Mozilla Firefox
Description
Sandbox escape due to race condition in the Networking component. This vulnerability was fixed in Firefox 158, 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
This vulnerability involves a race condition in the Networking component of Mozilla Firefox that can lead to sandbox escape. The sandbox is a security mechanism designed to isolate processes and limit the impact of exploits. The race condition flaw undermines this isolation, potentially allowing malicious code to execute outside the sandbox. Mozilla fixed this vulnerability in Firefox 158 and Firefox ESR 153.5.
Potential Impact
Successful exploitation could allow an attacker to escape the sandbox environment, potentially increasing the scope of compromise beyond the browser's restricted context. No known exploits in the wild have been reported at the time of publication.
Mitigation Recommendations
Mozilla has released official fixes for this vulnerability in Firefox 158 and Firefox ESR 153.5. Users and administrators should update to these versions or later to remediate the issue.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mozilla
- Date Reserved
- 2026-10-13T00:30:01.156Z
- State
- PUBLISHED
- Vendor Advisory Urls
- [{"url":"https://www.mozilla.org/security/advisories/mfsa2026-106/","vendor":"Mozilla"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-108/","vendor":"Mozilla"}]
Threat ID: 6ace2c4d2cdf04f65661d559
Added to database: 10/13/2026, 13:04:13 UTC
Last enriched: 10/13/2026, 13:34:34 UTC
Last updated: 10/13/2026, 18:57:33 UTC
Views: 9
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