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FreeRDP EUVDEUVD-2026-51811

| CVE-2026-67292 CRITICAL
Improper Handling of Length Parameter Inconsistency (CWE-130)
2026-08-01 VulnCheck GHSA-v4xr-wq7x-967g
Denial Of Service Freerdp Red Hat Suse
Critical
Disputed · 9.3 Vendor: VulnCheck
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Severity by source

Sources disagree (Medium–Critical)
Vendor (VulnCheck) PRIMARY
9.3 CRITICAL
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
8.2 HIGH

Malicious peer needs no auth (PR:N) over the network (AV:N/AC:L); impact is limited stale-buffer disclosure (C:L) plus an assertion crash DoS (A:H), with no described integrity impact (I:N).

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
6.5 MEDIUM
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
Red Hat
6.5 MEDIUM
qualitative

vuln.today treats the vendor’s rating as authoritative. A higher third-party CVSS (e.g. CISA-ADP) is shown for transparency but does not drive the headline severity.

CVSS VectorVendor: VulnCheck

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

3
Source Code Evidence Fetched
Aug 01, 2026 - 13:01 vuln.today
Analysis Generated
Aug 01, 2026 - 13:01 vuln.today
CVE Published
Aug 01, 2026 - 12:22 cve.org
CRITICAL 9.3

DescriptionCVE.org

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).

AnalysisAI

Memory over-disclosure and denial of service in FreeRDP RDP clients (before 3.29.0) using the gateway WebSocket transport allows a malicious or man-in-the-middle gateway/WebSocket peer to read bytes beyond a received Ping payload or crash the client. Because the client's Pong reply reuses a fixed 1024-byte response stream whose length is never sealed to the actual Ping payload, a non-empty Ping causes the client to return an overlong Pong that leaks stale buffer contents (including the masking key, which lets the peer unmask the reply); a zero-length Ping hits an assertion and terminates the client. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Position as/MITM the WebSocket gateway
Delivery
Victim client connects through peer
Exploit
Send non-empty or zero-length Ping frame
Execution
Client emits overlong Pong from reused buffer
Impact
Read leaked memory and masking key, or crash client
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Vulnerability AssessmentAI

Exploitation Exploitation requires the FreeRDP client to be using the gateway WebSocket transport (RDP tunneled over HTTPS/WebSocket) and to connect to an attacker-controlled or man-in-the-middle WebSocket gateway/peer; the malicious peer then sends a non-empty Ping control frame to trigger the over-disclosure, or a zero-length Ping to trigger the assertion-based denial of service. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The provided CVSS 4.0 vector (9.3, AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H) rates all three impacts High, but the described behavior does not clearly support VI:H - the vulnerability is an information over-disclosure (confidentiality) plus an assertion-based crash (availability), with no described mechanism to modify client data or execute code, so the integrity rating appears inflated versus the description; verify with the vendor. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker who controls or man-in-the-middles the RDP gateway a victim connects to sends a crafted non-empty WebSocket Ping to the FreeRDP client; the client replies with an overlong Pong drawn from its reused 1024-byte buffer, leaking adjacent memory and the masking key so the attacker can unmask and read the disclosed bytes. Alternatively, the attacker sends a zero-length Ping to trip the client's assertion and terminate the session (DoS). …
Remediation Upgrade FreeRDP to version 3.29.0 or later, which seals the Pong response length to the received Ping payload (Vendor-released patch: 3.29.0, referenced by GHSA-8v6m-2cmc-chx9 and fix commit f3b4347105114fe7453828736bea069999af319f). … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, conduct an asset inventory to identify all systems running FreeRDP clients and their current versions; prioritize systems with network exposure. …

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Threat intelligence, references, and detailed analysis are available after sign-in.

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise Desktop 15 SP7 Not-Affected
SUSE Linux Enterprise Module for Package Hub 15 SP7 Not-Affected
SUSE Linux Enterprise Module for Package Hub 15 SP7 Not-Affected
SUSE Linux Enterprise Server 15 SP7 Affected

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EUVD-2026-51811 vulnerability details – vuln.today
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