Vulnerability 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.
Related Weaknesses (CWE)
References
FAQ
What is CVE-2026-63276?
CVE-2026-63276 is a documented vulnerability. 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 c...
How severe is CVE-2026-63276?
CVSS scoring is not yet available for CVE-2026-63276. Check NVD for updates.
Is there a patch for CVE-2026-63276?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.