{"id":"CVE-2026-109708","title":"Sandbox escape due to incorrect boundary conditions in the Networking component","summary":"Sandbox escape due to incorrect boundary conditions in the Networking component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.","severity":"critical","published":"2026-10-13","updated":"2026-10-13","sourceUpdated":"2026-10-13T19:18:34.247","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-109708","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2059151","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"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-119/"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-10-13T13:27:03.991Z","vendor":"Mozilla","product":"Firefox","affected":["Firefox","Thunderbird"],"cvss":9.6,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H","ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-15T19:52:36.695793Z"},"cvssSource":"adp","epss":0.0032,"epssPercentile":0.2486,"slug":"CVE-2026-109708","body":"## Overview\n\nSandbox escape due to incorrect boundary conditions 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":"midnight","depthScore":53,"depthScoreParts":{"impact":52.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":222714,"id":"CVE-2026-109708","ts":1792097058866,"field":"cvss","old":null,"new":"9.6"},{"seq":222713,"id":"CVE-2026-109708","ts":1792097058866,"field":"severity","old":"none","new":"critical"}]}