{"id":"CVE-2026-109757","title":"Sandbox escape due to race condition in the Networking component","summary":"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.","severity":"high","cvss":8.3,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H","cwe":["CWE-362"],"vendor":"Mozilla","product":"Firefox","affected":["Firefox","Thunderbird"],"published":"2026-10-13","updated":"2026-10-15","sourceUpdated":"2026-10-15T20:17:08.243","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-109757","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2069910","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-106/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-108/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-109/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-110/","label":"security@mozilla.org"}],"tags":["nvd","cve.org"],"epss":0.00258,"epssPercentile":0.17354,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-15T19:56:25.886376Z"},"ingestedAt":"2026-10-13T13:27:04.009Z","slug":"CVE-2026-109757","body":"## Overview\n\nSandbox 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":46,"depthScoreParts":{"impact":45.7,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":222704,"id":"CVE-2026-109757","ts":1792097055261,"field":"cvss","old":null,"new":"8.3"},{"seq":222703,"id":"CVE-2026-109757","ts":1792097055261,"field":"severity","old":"none","new":"high"}]}