Out-of-bounds read in FreeRDP - CVE-2026-91956

CSH
CYBERSECURITY HELP
Sign In REGISTER
 
Main Vulnerability Database Vulnerabilities #VU146588

Out-of-bounds read in FreeRDP - CVE-2026-91956

Published: September 1, 2026 / Updated: September 16, 2026


Vulnerability identifier: #VU146588
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-91956
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to an out-of-bounds read in func_get_ep_desc() in the URBDRC channel when processing a crafted SELECT_CONFIGURATION descriptor followed by a bulk or interrupt transfer request. A remote attacker can send a crafted RDP server response to cause a denial of service.

Exploitation is reachable on clients with USB redirection enabled and relies on an InterfaceNumber-to-array-position mismatch together with an unchecked AlternateSetting index.


Affected software

FreeRDP
openEuler
freerdp
libwinpr-devel
libwinpr
freerdp-help
freerdp-devel
freerdp-debugsource
freerdp-debuginfo

How to mitigate CVE-2026-91956

Install security update from vendor's website.

FreeRDP - update to 3.31.0
freerdp - update to 2.11.8-11
libwinpr-devel - update to 2.11.8-11
libwinpr - update to 2.11.8-11
freerdp-help - update to 2.11.8-11
freerdp-devel - update to 2.11.8-11
freerdp-debugsource - update to 2.11.8-11
freerdp-debuginfo - update to 2.11.8-11

External References

Related Security Bulletins