{"id":"CVE-2026-109723","title":"Integer overflow in the Layout: Text and Fonts component","summary":"Integer overflow in the Layout: Text and Fonts component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.","severity":"medium","cvss":5.4,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N","cwe":["CWE-190"],"vendor":"Mozilla","product":"Firefox","affected":["Firefox","Thunderbird"],"published":"2026-10-13","updated":"2026-10-15","sourceUpdated":"2026-10-15T20:17:07.470","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-109723","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2074171","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":0.00217,"epssPercentile":0.12109,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-15T19:54:31.450474Z"},"ingestedAt":"2026-10-13T13:27:03.997Z","slug":"CVE-2026-109723","body":"## Overview\n\nInteger overflow in the Layout: Text and Fonts 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":222709,"id":"CVE-2026-109723","ts":1792097056864,"field":"cvss","old":null,"new":"5.4"},{"seq":222708,"id":"CVE-2026-109723","ts":1792097056864,"field":"severity","old":"none","new":"medium"}]}