Integer Overflow Vulnerability in FreeRDP Versions by FreeRDP
CVE-2026-91960

7.1HIGH

Key Information:

Vendor

Freerdp

Status
Freerdp
Vendor
CVE Published:
15 September 2026

What is CVE-2026-91960?

FreeRDP versions prior to 3.31.0 are subject to an integer overflow vulnerability in the Stream_EnsureRemainingCapacity function of WinPR. This flaw allows remote attackers to exploit the system by sending a specially crafted WebSocket Ping frame with an extended payload length, causing integer wraparound. Such exploitation can lead to a double free condition, causing the FreeRDP client to crash during connection attempts. This vulnerability highlights significant security risks within remote desktop connections facilitated by FreeRDP.

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

Nambers
.