{"id":"CVE-2026-109731","title":"Incorrect boundary conditions in the Graphics: Canvas2D component","summary":"Incorrect boundary conditions in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.","severity":"medium","published":"2026-10-13","updated":"2026-10-13","sourceUpdated":"2026-10-13T19:18:37.090","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-109731","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2075436","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"],"ingestedAt":"2026-10-13T13:27:04.000Z","vendor":"Mozilla","product":"Firefox","affected":["Firefox","Thunderbird"],"epss":0.00231,"epssPercentile":0.13854,"cvss":5.4,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N","ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-19T11:08:16.552453Z"},"cvssSource":"adp","slug":"CVE-2026-109731","body":"## Overview\n\nIncorrect boundary conditions in the Graphics: Canvas2D 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":"sunlit","depthScore":30,"depthScoreParts":{"impact":29.7,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":224907,"id":"CVE-2026-109731","ts":1792412886420,"field":"cvss","old":null,"new":"5.4"},{"seq":224906,"id":"CVE-2026-109731","ts":1792412886420,"field":"severity","old":"none","new":"medium"}]}