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    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-63276",
        "assignerOrgId": "4fe7d05b-1353-44cc-8b7a-1e416936dff2",
        "state": "PUBLISHED",
        "assignerShortName": "Document Fdn.",
        "dateReserved": "2026-07-16T08:17:05.512Z",
        "datePublished": "2026-09-22T11:10:32.057Z",
        "dateUpdated": "2026-09-22T12:21:57.496Z"
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            "title": "Stack buffer overflow in CFF to Type 1 font conversion",
            "datePublic": "2026-09-21T23:59:00.000Z",
            "descriptions": [
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                    "lang": "en",
                    "value": "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.",
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                            "value": "<p>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.</p><p>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.</p><p>In fixed versions the remaining capacity is tracked and the conversion stops when it is used up.</p>"
                        }
                    ]
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            "affected": [
                {
                    "vendor": "The Document Foundation",
                    "product": "LibreOffice",
                    "defaultStatus": "unknown",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "26.2",
                            "lessThan": "< 26.2.5",
                            "versionType": "26.2 series"
                        }
                    ]
                }
            ],
            "credits": [
                {
                    "lang": "en",
                    "type": "finder",
                    "value": "Claude, found by Anthropic using agents to study the security of open-source projects"
                },
                {
                    "lang": "en",
                    "type": "analyst",
                    "value": "Ada Logics, validating and reporting"
                },
                {
                    "lang": "en",
                    "type": "remediation developer",
                    "value": "Caolán McNamara of Collabora Productivity"
                }
            ],
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "lang": "en",
                            "cweId": "CWE-787",
                            "description": "CWE-787 Out-of-bounds Write",
                            "type": "CWE"
                        }
                    ]
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            ],
            "impacts": [
                {
                    "capecId": "CAPEC-44",
                    "descriptions": [
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                            "lang": "en",
                            "value": "CAPEC-44 Overflow Binary Resource File"
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                    ]
                }
            ],
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                            "value": "GENERAL"
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                        "attackVector": "LOCAL",
                        "attackComplexity": "LOW",
                        "attackRequirements": "NONE",
                        "privilegesRequired": "NONE",
                        "userInteraction": "PASSIVE",
                        "vulnConfidentialityImpact": "LOW",
                        "vulnIntegrityImpact": "LOW",
                        "vulnAvailabilityImpact": "HIGH",
                        "subConfidentialityImpact": "NONE",
                        "subIntegrityImpact": "NONE",
                        "subAvailabilityImpact": "NONE",
                        "exploitMaturity": "PROOF_OF_CONCEPT",
                        "Safety": "NOT_DEFINED",
                        "Automatable": "NOT_DEFINED",
                        "Recovery": "NOT_DEFINED",
                        "valueDensity": "NOT_DEFINED",
                        "vulnerabilityResponseEffort": "NOT_DEFINED",
                        "providerUrgency": "NOT_DEFINED",
                        "version": "4.0",
                        "baseSeverity": "MEDIUM",
                        "baseScore": 5.4,
                        "vectorString": "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"
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            ],
            "references": [
                {
                    "url": "https://www.libreoffice.org/about-us/security/advisories/cve-2026-63276"
                }
            ],
            "source": {
                "discovery": "EXTERNAL"
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                                "timestamp": "2026-09-22T12:21:19.661928Z",
                                "id": "CVE-2026-63276",
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                                        "Exploitation": "none"
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                                "role": "CISA Coordinator",
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                "title": "CISA ADP Vulnrichment",
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