CVE-2026-56001

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{"bugzilla": {"description": "libXfont2: BitmapScaleBitmaps Integer Overflow Heap Buffer Overflow", "id": "2496640", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2496640"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.3", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H", "status": "draft"}, "details": ["A flaw was found in libXfont2. In the BitmapScaleBitmaps() function, an integer overflow can occur when calculating the memory needed for font glyphs. This overflow leads to a heap buffer overflow, where a smaller-than-required memory buffer is allocated. A local attacker can exploit this by loading a specially crafted PCF font, potentially leading to arbitrary code execution or a denial of service."], "name": "CVE-2026-56001", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "libXfont2", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "libXfont2", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "libXfont2", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "libXfont2", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-07-08T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-56001\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-56001"], "statement": "This flaw in libXfont2 is rated as Important. A local attacker could exploit an integer overflow in the `BitmapScaleBitmaps()` function, leading to a heap buffer overflow and potential arbitrary code execution or denial of service. This vulnerability requires the processing of a specially crafted PCF font, typically through an X server or an application configured to load untrusted font files.", "threat_severity": "Important"}

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