{"id":"CVE-2026-63276","title":"LibreOffice converts CFF fonts to Type 1 when it subsets a font, which happens when a document is exported to PDF, and CFF fonts may be embedded in documents","summary":"LibreOffice converts CFF fonts to Type 1 when it subsets a font, which happens when a document is exported to PDF, and CFF fonts may be embedded in documents. A stack buffer overflow existed in that conversion. The converted operators we…","severity":"medium","cvss":5.4,"cvssVector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N/E:P","cwe":["CWE-787"],"vendor":"The Document Foundation","product":"LibreOffice","affected":["LibreOffice >= 26.2 < < 26.2.5"],"published":"2026-09-22","updated":"2026-09-22","sourceUpdated":"2026-09-22T19:09:32.273","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-63276","references":[{"url":"https://www.libreoffice.org/about-us/security/advisories/cve-2026-63276","label":"security@documentfoundation.org"}],"tags":["nvd","cve.org"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-22T12:21:19.661928Z"},"cvssSource":"cna","ingestedAt":"2026-09-22T12:03:01.596Z","slug":"CVE-2026-63276","body":"## Overview\n\nLibreOffice converts CFF fonts to Type 1 when it subsets a font, which happens when a document is exported to PDF, and CFF fonts may be embedded in documents. A stack buffer overflow existed in that conversion. The converted operators were written into a fixed size buffer with no check that they still fit, so a glyph emitting many operators wrote past the end of the buffer. In fixed versions the remaining capacity is tracked and the conversion stops when it is used up.\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":[]}