CVE-2026-121950

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{"bugzilla": {"description": "freerdp: FreeRDP: Heap buffer overflow via integer overflow in surface creation", "id": "2567633", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2567633"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-787", "details": ["FreeRDP before 3.32.2 does not check the product of surface dimensions in gdi_CreateSurface when handling an RDPGFX CREATE_SURFACE PDU, causing an integer wrap and heap buffer overflow on 32-bit builds and an approximately 4 GiB allocation on 64-bit builds. A malicious RDP server can send a CREATE_SURFACE PDU with width and height 32766 to a connecting client to corrupt heap memory or cause a denial of service.", "A flaw was found in FreeRDP. A malicious Remote Desktop Protocol (RDP) server can cause a denial of service (DoS) or memory corruption on a connecting client. This issue occurs because FreeRDP does not properly validate graphical surface dimensions, resulting in an integer overflow during memory allocation calculations. By sending a specially crafted surface creation message, a rogue server can trigger excessive memory consumption or a heap-based buffer overflow, causing the client application to crash."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability."}, "name": "CVE-2026-121950", "public_date": "2026-11-04T15:33:16Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-121950\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-121950\nhttps://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-f53w-3364-jr35\nhttps://www.vulncheck.com/advisories/freerdp-before-3.32.2-heap-overflow-via-rdpgfx-create-surface-integer-wrap"], "statement": "This vulnerability is evaluated as Moderate impact for Red Hat products because exploitation requires client-side user interaction to connect to an untrusted remote system, restricting the potential blast radius to the local application session. On standard 64-bit Red Hat Enterprise Linux architectures, the arithmetic wrap does not occur; instead, the oversized dimension request triggers an excessively large memory allocation that terminates the client process rather than corrupting memory. As a result, an attacker is limited to causing a denial of service on the client without compromising host system integrity or achieving arbitrary code execution.", "threat_severity": "Moderate"}

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