Copyright © 2012 Red Hat, Inc. All rights reserved. Moderate 2026-09-15T15:18:15 FreeRDP: FreeRDP: Denial of Service via URBDRC control-transfer request with invalid OutputBufferSize 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H CWE-617

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-transfer request with OutputBufferSize set to 65536, triggering a reachable assertion that terminates the client process.

A flaw was found in FreeRDP. A malicious Remote Desktop Protocol (RDP) server can send a Universal Serial Bus (USB) Redirection for Remote Desktop Connection (URBDRC) control-transfer request with an invalid OutputBufferSize. This can trigger an assertion in the client process, leading to a denial of service where the client application terminates unexpectedly.

To mitigate this issue, users should only connect to trusted RDP servers. Additionally, running the FreeRDP client within a sandboxed environment can help limit the potential impact of such vulnerabilities. Red Hat Enterprise Linux 10 Affected freerdp Red Hat Enterprise Linux 6 Out of support scope freerdp Red Hat Enterprise Linux 7 Affected freerdp Red Hat Enterprise Linux 8 Affected freerdp Red Hat Enterprise Linux 9 Affected freerdp https://www.cve.org/CVERecord?id=CVE-2026-91961 https://nvd.nist.gov/vuln/detail/CVE-2026-91961 https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-w9qg-g24r-77f6 https://www.vulncheck.com/advisories/freerdp-before-3.31.0-denial-of-service-via-urbdrc