CVE-2026-91964

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{"bugzilla": {"description": "FreeRDP: FreeRDP: Remote code execution via heap buffer overflow in Server Redirection PDU", "id": "2533911", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2533911"}, "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-120", "details": ["A flaw was found in FreeRDP. A malicious Remote Desktop Protocol (RDP) server can exploit a heap-based buffer overflow vulnerability in the `nego_send_negotiation_request` function. By sending a specially crafted Server Redirection PDU message with an attacker-controlled `LoadBalanceInfo` field, the server can write an arbitrary-length field into a fixed-size buffer without proper validation. This can lead to a denial of service (client crash) or, when chained with a memory disclosure vulnerability, potentially remote code execution on the client system."], "mitigation": {"lang": "en:us", "value": "Users of FreeRDP clients should avoid connecting to untrusted or unknown RDP servers. This operational control reduces the risk of exploitation, as a malicious server is required to trigger the heap-based buffer overflow."}, "name": "CVE-2026-91964", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "freerdp", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "freerdp", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "freerdp", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "freerdp", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "freerdp", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-09-15T15:18:17Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-91964\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-91964\nhttps://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-2vf2-grvj-6g8x\nhttps://www.vulncheck.com/advisories/freerdp-2.0.0-through-3.30.0-heap-buffer-overflow-via-routingtoken"], "threat_severity": "Important"}

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