Denial-of-Service Vulnerability in FreeRDP by FreeRDP Project
CVE-2026-91961

7.1HIGH

Key Information:

Vendor

Freerdp

Status
Freerdp
Vendor
CVE Published:
15 September 2026

What is CVE-2026-91961?

FreeRDP prior to version 3.31.0 is vulnerable to a denial-of-service attack due to improper validation of the OutputBufferSize in the URBDRC control-transfer request path. An attacker can exploit this vulnerability by sending a specially crafted control-transfer request from a malicious RDP server, setting the OutputBufferSize to an excessive value (65536). This leads to a reachable assertion that causes the client process to terminate, interrupting the service.

Affected Version(s)

FreeRDP 0 < 3.31.0

FreeRDP 3.31.0

References

https://github.com/FreeRDP/FreeRDP/security/advisories/GH...
vendor-advisory
https://www.vulncheck.com/advisories/freerdp-before-3.31....
third-party-advisory

CVSS V4

Score:
7.1
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

gulamovzavohir02-glitch
.