CVE-2026-121406

FreeRDP before 3.32.2 allows a client assertion abort because rdpgfx_on_data_received rejects only negative zgfx_decompress status and passes the resulting null output pointer to Stream_StaticConstInit. A malicious RDP server can send a zero-output ZGFX payload on the RDPGFX channel after session activation to terminate the client.

CVSS v3 4.3 MEDIUM

4.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact LOW

Scope UNCHANGED

References

Link	Resource
https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-2c9x-4gr7-hrwx	Vendor Advisory
https://www.vulncheck.com/advisories/freerdp-before-3.32.2-client-denial-of-service-via-zero-output-zgfx-payload	Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:*

History

03 Nov 2026, 15:59

Type	Values Removed	Values Added
CPE		cpe:2.3:a:freerdp:freerdp::::::::
References	~~() https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-2c9x-4gr7-hrwx -~~	() https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-2c9x-4gr7-hrwx - Vendor Advisory
References	~~() https://www.vulncheck.com/advisories/freerdp-before-3.32.2-client-denial-of-service-via-zero-output-zgfx-payload -~~	() https://www.vulncheck.com/advisories/freerdp-before-3.32.2-client-denial-of-service-via-zero-output-zgfx-payload - Third Party Advisory
First Time		Freerdp Freerdp freerdp

03 Nov 2026, 15:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-11-03 15:17

Updated : 2026-11-03 15:59

NVD link : CVE-2026-121406

Mitre link : CVE-2026-121406

CVE.ORG link : CVE-2026-121406

JSON object : View

Products Affected

freerdp

freerdp

CWE

CWE-617

Reachable Assertion

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