{"id":"CVE-2026-63276","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-63276","generatedAt":"2026-10-28T02:57:02.804Z","title":"A stack buffer overflow existed in that conversion.","description":"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 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.","published":"2026-09-22T12:17:14.000Z","lastModified":"2026-09-22T19:09:32.000Z","status":"Deferred","sourceIdentifier":"security@documentfoundation.org","cvss":{"version":"4.0","score":5.4,"severity":"MEDIUM","vector":"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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M"},"cwe":["CWE-787"],"affected":[],"epss":{"score":0.00195,"percentile":0.09145,"date":"2026-10-26","history":[{"date":"2026-09-23","score":0.00167,"percentile":0.06397}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.19%). Track it; it rarely justifies an emergency change on its own."},"changes":[{"kind":"new","label":"New CVE","at":"2026-09-22T12:17:14.000Z","detail":{"score":"5.4","severity":"MEDIUM","publishedAt":"2026-09-22T12:17:13.547Z"},"summary":"New CVE, medium severity (CVSS 5.4)."}],"references":[{"url":"https://www.libreoffice.org/about-us/security/advisories/cve-2026-63276","source":"security@documentfoundation.org"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-63276","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}