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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

Original advisory

cve-program · CVE-2026-63276

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-63276

Published

LibreOffice

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "The Document Foundation",
                    "product": "LibreOffice",
                    "defaultStatus": "unknown",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "26.2",
                            "lessThan": "< 26.2.5",
                            "versionType": "26.2 series"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON