23 Oct 2026 15:48:27 UTC
Stack buffer overflow in CFF to Type 1 font conversion
cve-program · CVE-2026-63276 · Published
CVE-2026-63276
Stack buffer overflow in CFF to Type 1 font conversion
CVSS 4.0 5.4 MEDIUMCheck source for fixed versionsKEV status unknown
cve-program · CVE-2026-63276
PublishedLibreOffice 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.
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