Client memory disclosure via overlong WebSocket Pong
Published Aug 1, 2026 · Updated Aug 1, 2026
Buffer over-disclosure in FreeRDP before 3.29.0 allows remote attackers to read client memory via a crafted WebSocket Ping frame. websocket_reply_pong() sends the fixed 1024-byte response stream by Stream_Length rather than sealing it to the received payload length. Exploitation requires a client connection to a malicious gateway or WebSocket peer; non-empty Pings expose trailing bytes, while an empty Ping triggers an assertion and crashes the client.
Summary
What happened
Buffer over-disclosure in FreeRDP before 3.29.0 allows remote attackers to read client memory via a crafted WebSocket Ping frame. websocket_reply_pong() sends the fixed 1024-byte response stream by Stream_Length rather than sealing it to the received payload length. Exploitation requires a client connection to a malicious gateway or WebSocket peer; non-empty Pings expose trailing bytes, while an empty Ping triggers an assertion and crashes the client.
The record
- CVE
- CVE-2026-67292
- Published
- Aug 1, 2026
- Updated
- Aug 1, 2026
- Vendor
- FreeRDP
- Product
- FreeRDP
- Classifications
- CWE-130
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 1, 2026CVE publishedPublication date reported by the CVE source.
- Aug 1, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <3.29.0
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- FreeRDP WebSocket Ping reproductionproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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