FreeRDP up to 3.31.x WebSocket Transport websocket_reply_pong null pointer dereference

Summaryinfo

A vulnerability marked as problematic has been reported in FreeRDP up to 3.31.x. This affects the function websocket_reply_pong of the component WebSocket Transport. This manipulation causes null pointer dereference. This vulnerability appears as CVE-2026-111373. The attack may be initiated remotely. There is no available exploit. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability has been found in FreeRDP up to 3.31.x and classified as problematic. Affected by this vulnerability is the function websocket_reply_pong of the component WebSocket Transport. The manipulation with an unknown input leads to a null pointer dereference vulnerability. The CWE definition for the vulnerability is CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. As an impact it is known to affect availability. The summary by CVE is:

FreeRDP before 3.32.0 contains a NULL pointer dereference vulnerability in the websocket transport that allows a malicious gateway to crash clients by sending zero-length pings. When the payload length is zero, websocket_reply_pong passes a nullptr stream to websocket_reply_close, triggering an assertion failure that terminates the client process and causes denial of service.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-111373 since 10/15/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available.

Upgrading to version 3.32.0 eliminates this vulnerability.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Remote Access Software

Name

• FreeRDP

Version

• 3.0
• 3.1
• 3.2
• 3.3
• 3.4
• 3.5
• 3.6
• 3.7
• 3.8
• 3.9
• 3.10
• 3.11
• 3.12
• 3.13
• 3.14
• 3.15
• 3.16
• 3.17
• 3.18
• 3.19
• 3.20
• 3.21
• 3.22
• 3.23
• 3.24
• 3.25
• 3.26
• 3.27
• 3.28
• 3.29
• 3.30
• 3.31

License

• open-source

Website

• Product: https://github.com/FreeRDP/FreeRDP/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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