Null Pointer Dereference in FreeRDP WebSocket Transport
CVE-2026-111373

6.9MEDIUM

Key Information:

Vendor

Freerdp

Status
Freerdp
Vendor
CVE Published:
16 October 2026

What is CVE-2026-111373?

FreeRDP versions before 3.32.0 have a vulnerability in the WebSocket transport mechanism that allows an attacker to exploit a NULL pointer dereference by sending a zero-length ping. This specific input causes the function websocket_reply_pong to pass a null stream pointer to websocket_reply_close, leading to an assertion failure. As a result, client processes may crash, resulting in denial of service and disrupting normal user operations.

Affected Version(s)

FreeRDP 0 < 3.32.0

FreeRDP 3.32.0

References

https://github.com/FreeRDP/FreeRDP/security/advisories/GH...
vendor-advisory
https://www.vulncheck.com/advisories/freerdp-before-3.32....
third-party-advisory

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

w226688
.