{"id":"CVE-2026-91951","title":"FreeRDP versions before 3.31.0 contain an out-of-bounds write vulnerability in the urbdrc client channel's urb_send_current_frame_number_result() function","summary":"FreeRDP versions before 3.31.0 contain an out-of-bounds write vulnerability in the urbdrc client channel's urb_send_current_frame_number_result() function. A malicious RDP server can send a crafted 28-byte USB redirection message to trig…","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","CWE-787"],"vendor":"freerdp","product":"freerdp","affected":["freerdp >= 3.14.0, < 3.31.0"],"patched":["freerdp 3.31.0"],"published":"2026-09-15","updated":"2026-09-24","sourceUpdated":"2026-09-24T12:15:20.537","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-91951","references":[{"url":"https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-h5w2-q35j-443h","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/freerdp-3.14.0-through-3.30.0-out-of-bounds-write-via-urbdrc","label":"disclosure@vulncheck.com"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-91951.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-91951"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2533928"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-91951"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-91951"}],"tags":["nvd","cve.org","exploit-available","csaf","vex","red-hat"],"epss":0.00346,"epssPercentile":0.28234,"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-20T00:28:36.418550Z"},"ingestedAt":"2026-09-15T15:39:12.920Z","slug":"CVE-2026-91951","body":"## Overview\n\nFreeRDP versions before 3.31.0 contain an out-of-bounds write vulnerability in the urbdrc client channel's urb_send_current_frame_number_result() function. A malicious RDP server can send a crafted 28-byte USB redirection message to trigger a 4-byte write past the allocated 16-byte buffer, causing denial of service when verbose asserts are enabled.\n\n## Affected\n\n- `freerdp >= 3.14.0, < 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 · no fix planned: Red Hat Enterprise Linux 10 · updated 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-91951.json)","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":207848,"id":"CVE-2026-91951","ts":1789866747467,"field":"exploit_available","old":"false","new":"true"}]}