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{"bugzilla": {"description": "FreeRDP: FreeRDP: Denial of Service via crafted Surface Bits command", "id": "2533906", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2533906"}, "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-476", "details": ["A flaw was found in FreeRDP. A malicious Remote Desktop Protocol (RDP) server can trigger a null pointer dereference in the `gdi_surface_bits` function by sending a specially crafted Surface Bits command that claims to use the NSCodec codec ID. This vulnerability exists even when the NSCodec is disabled in the client. Successful exploitation allows a remote attacker to cause a FreeRDP client to crash, leading to a denial of service."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, users should avoid connecting to untrusted or unknown RDP servers with FreeRDP clients. This vulnerability requires a FreeRDP client to connect to a malicious RDP server to be exploited."}, "name": "CVE-2026-91954", "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": "2026-09-15T15:18:10Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-91954\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-91954\nhttps://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-ffjr-p229-hpch\nhttps://www.vulncheck.com/advisories/freerdp-before-3.31.0-null-pointer-dereference-via-nscodec"], "threat_severity": "Moderate"}

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