{"id":"CVE-2026-91961","title":"FreeRDP before 3.31.0 contains a denial-of-service vulnerability in the URBDRC control-transfer request path that fails to validate OutputBufferSize before forwarding to the libusb backend","summary":"FreeRDP before 3.31.0 contains a denial-of-service vulnerability in the URBDRC control-transfer request path that fails to validate OutputBufferSize before forwarding to the libusb backend. A malicious RDP server can send a control-trans…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","cwe":["CWE-617"],"vendor":"freerdp","product":"freerdp","affected":["freerdp < 3.31.0"],"patched":["freerdp 3.31.0"],"published":"2026-09-15","updated":"2026-09-23","sourceUpdated":"2026-09-23T20:02:24.160","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-91961","references":[{"url":"https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-w9qg-g24r-77f6","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/freerdp-before-3.31.0-denial-of-service-via-urbdrc","label":"disclosure@vulncheck.com"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-91961.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-91961"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2533968"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-91961"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-91961"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.00371,"epssPercentile":0.28262,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-18T17:15:40.348894Z"},"ingestedAt":"2026-09-15T15:39:12.916Z","slug":"CVE-2026-91961","body":"## Overview\n\nFreeRDP before 3.31.0 contains a denial-of-service vulnerability in the URBDRC control-transfer request path that fails to validate OutputBufferSize before forwarding to the libusb backend. A malicious RDP server can send a control-transfer request with OutputBufferSize set to 65536, triggering a reachable assertion that terminates the client process.\n\n## Affected\n\n- `freerdp < 3.31.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `freerdp 3.31.0`\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-91961.json)","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}