{"id":"CVE-2026-91963","title":"FreeRDP versions before 3.31.0 contain an uninitialized heap memory disclosure vulnerability in the urbdrc USB redirection channel","summary":"FreeRDP versions before 3.31.0 contain an uninitialized heap memory disclosure vulnerability in the urbdrc USB redirection channel. A malicious RDP server can induce failing USB transfers to read uninitialized heap memory from the client…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N","cwe":["CWE-457","CWE-824"],"vendor":"FreeRDP","product":"FreeRDP","affected":["FreeRDP >= 2.0.0 < 3.0.0","FreeRDP >= 3.0.0 < 3.31.0","FreeRDP < 3.31.0"],"published":"2026-09-15","updated":"2026-09-16","sourceUpdated":"2026-09-16T20:15:36.037","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-91963","references":[{"url":"https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-hw7p-5h2r-83gq","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/freerdp-2.0.0-through-3.30.0-uninitialized-heap-memory-disclosure-via-urbdrc","label":"disclosure@vulncheck.com"},{"url":"https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-hw7p-5h2r-83gq","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-91963.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-91963"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2533930"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-91963"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-91963"}],"tags":["nvd","cve.org","exploit-available","csaf","vex","red-hat","score-dispute"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-15T15:56:52.431518Z"},"scores":{"nvd":6.5,"vendor":8.8},"ingestedAt":"2026-09-15T15:39:12.916Z","epss":0.0064,"epssPercentile":0.48916,"slug":"CVE-2026-91963","body":"## Overview\n\nFreeRDP versions before 3.31.0 contain an uninitialized heap memory disclosure vulnerability in the urbdrc USB redirection channel. A malicious RDP server can induce failing USB transfers to read uninitialized heap memory from the client, defeating ASLR and enabling remote code execution when chained with memory corruption vulnerabilities.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Important · 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-2026-91963.json)","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":204282,"id":"CVE-2026-91963","ts":1789490445206,"field":"exploit_available","old":"false","new":"true"}]}