Medium [CVE-2026-67292] Information Disclosure and Denial of Service via WebSocket Ping
This medium-severity Red Hat Linux advisory covers CVE-2026-67292 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7.
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Summary
FreeRDP before 3.29.0 contains a buffer over-disclosure vulnerability in the gateway WebSocket transport (libfreerdp/core/gateway/websocket.c).
The client's Pong reply reuses a fixed 1024-byte response stream whose length is not sealed to the actual received Ping payload, so a malicious gateway/WebSocket peer sending a non-empty Ping control frame causes the client to reply with an overlong Pong that discloses bytes beyond the received payload (the peer receives the masking key and can unmask the reply).
A zero-length Ping reaches an assertion and terminates the client (denial of service). A flaw was found in FreeRDP, a remote desktop protocol client.
This could cause the client to send an overly long Pong reply, leading to the disclosure of sensitive information beyond the intended payload.
This issue is classified as Moderate severity because successful exploitation requires a user to connect to a malicious gateway or server, where a crafted Ping control frame can trigger a client memory disclosure or cause an application crash leading to a denial of service. Red Hat severity: Moderate — CVSS 6.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L).
Weakness: CWE-805. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9.
- < 3.29.0
Official advisory · high-confidence parse· fetched 28 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 28 days ago·verify at source
Mitigation checklist
- To mitigate this vulnerability, avoid connecting to untrusted RDP gateways when using FreeRDP. This flaw specifically affects the client when interacting with a malicious gateway, which can exploit the WebSocket transport to trigger information disclosure or a denial of service.
Official advisory · high-confidence parse· fetched 28 days ago·verify at source
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