CVE-2026-121958

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{"bugzilla": {"description": "freerdp: FreeRDP: Heap-based buffer overflow via surface key truncation in RDPGFX", "id": "2567629", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2567629"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.8", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-787", "details": ["FreeRDP through 3.32.1 has a heap out-of-bounds write in the RDPGFX client because the delete_surface callback truncates surface hash keys to 16 bits, leaving the surface table inconsistent so HashTable_GetKeys writes past its allocated key array. A malicious or man-in-the-middle RDP server can exploit this by creating surfaceId 0xFFFF, closing the RDPGFX channel, sending repeated DELETESURFACE PDUs, and then sending ENDFRAME or RESETGRAPHICS.", "A flaw was found in FreeRDP. This vulnerability allows a remote attacker to cause a Denial of Service (DoS) or potentially execute arbitrary code on the client system. An attacker operating a malicious Remote Desktop Protocol (RDP) server, or acting in a man-in-the-middle position, can exploit this issue by sending specially crafted graphics pipeline commands. This occurs due to improper surface key truncation, causing an internal table to become inconsistent and triggering a heap-based buffer overflow when data is written past allocated memory boundaries."], "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-2026-121958", "public_date": "2026-11-04T15:33:22Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-121958\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-121958\nhttps://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-m59q-wm7v-mp57\nhttps://www.vulncheck.com/advisories/freerdp-through-3.32.1-heap-out-of-bounds-write-via-rdpgfx-hashtable-getkeys"], "statement": "This vulnerability is rated as Important severity because an untrusted or compromised remote desktop server can trigger heap memory corruption in the client process, potentially leading to arbitrary code execution or application crash. To exploit this flaw, a user must actively establish a remote desktop connection to a rogue server or have their traffic intercepted by a malicious intermediary. Red Hat Enterprise Linux systems acting purely as remote desktop servers or that do not initiate outbound connections to untrusted endpoints are not exposed to this issue.", "threat_severity": "Important"}

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