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{"bugzilla": {"description": "libreoffice: stack buffer overflow in CFF font hint handling", "id": "2538363", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2538363"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.3", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:H", "status": "draft"}, "cwe": "CWE-121", "details": ["LibreOffice can read CFF fonts, which may be embedded in documents. A stack buffer overflow existed when reading the hints of a glyph. The number of hints was checked against the wrong bound, so a glyph declaring more hints than the array can hold wrote past its end. In fixed versions the hint count is checked against the capacity the array really has.", "A flaw was found in LibreOffice. When a user opens a specially crafted document containing embedded CFF fonts, a stack-based buffer overflow can occur when reading the hints of a glyph due to improper bounds checking. This issue can cause memory corruption, resulting in an application crash."], "mitigation": {"lang": "en:us", "value": "Do not open documents from unknown or untrusted sources with LibreOffice."}, "name": "CVE-2026-63275", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Under investigation", "package_name": "libreoffice", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Under investigation", "package_name": "libreoffice", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Under investigation", "package_name": "libreoffice", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Under investigation", "package_name": "libreoffice", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-09-22T11:10:26Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-63275\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-63275\nhttps://www.libreoffice.org/about-us/security/advisories/cve-2026-63275"], "statement": "To exploit this issue, an attacker needs to convince a user to open a specially crafted document. This flaw can cause memory corruption, resulting in an application crash. However, the possibility of arbitrary code execution is not discarded. For these reasons, this vulnerability has been rated with a moderate severity.\nDefault Red Hat Enterprise Linux security features, including SELinux enforcement, Address Space Layout Randomization (ASLR) and NX (No-Execute) stack protection, significantly increase the difficulty of achieving arbitrary code execution, limiting the impact of this vulnerability.", "threat_severity": "Moderate"}

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