What’s Vulnerable › Vulnerabilities

CVE-2026-67292: FreeRDP before 3.29.0 WebSocket Ping Buffer Over-disclosure

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-08-01 · updated 2026-09-11
• Weakness: CWE-130

Description

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).

Affected products

• FreeRDP: before 3.29.0 — fixed in 3.29.0

How to fix

Upgrade to a fixed version: FreeRDP 3.29.0. Check the vendor advisory for mitigations.

References

• https://github.com/FreeRDP/FreeRDP/commit/f3b4347105114fe7453828736bea069999af319f
• https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-8v6m-2cmc-chx9
• https://www.vulncheck.com/advisories/freerdp-before-websocket-ping-buffer-over-disclosure
• https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-8v6m-2cmc-chx9

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