CVE-2026-121411
Analyzed Analyzed - Analysis Complete

Remote Code Execution in FreeRDP

Publication date: 2026-11-03

Last updated on: 2026-11-03

Assigner: VulnCheck

Description
FreeRDP before 3.32.2 fails to bound server-supplied target dimensions and output origin in RDPGFX MAPSURFACETOSCALEDOUTPUT PDUs, allowing malicious RDP servers to abort X11 clients. Attackers can map a surface to oversized scaled output, triggering checked UINT16 cast or freerdp_image_scale stride assertion failures that terminate the client.

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Meta Information

Published
2026-11-03
Last Modified
2026-11-03
Generated
2026-11-03
AI Q&A
2026-11-03
EPSS Evaluated
N/A
NVD
CVE-2026-121411
EUVD
EUVD-2026-115943

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
freerdp freerdp to 3.32.2 (exc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-20 The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

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Executive Summary

FreeRDP before version 3.32.2 has a vulnerability where it does not properly limit server-supplied dimensions and output origin in RDPGFX MAPSURFACETOSCALEDOUTPUT PDUs. This allows a malicious RDP server to crash X11 clients by mapping a surface to an oversized scaled output, causing checked UINT16 cast or image scale stride assertion failures that terminate the client.

Detection Guidance

Detection requires monitoring for abnormal RDP server behavior, such as sending oversized surface dimensions or invalid output origins. Check FreeRDP logs for assertion failures or client crashes during RDPGFX MAPSURFACETOSCALEDOUTPUT PDU processing. Inspect network traffic for malformed RDP packets targeting these PDUs.

Impact Analysis

If you use FreeRDP in an environment where you connect to untrusted RDP servers, an attacker controlling such a server could exploit this flaw to crash your X11 client application, disrupting your remote desktop session.

Mitigation Strategies

Upgrade FreeRDP to version 3.32.2 or later to address the issue. Avoid connecting to untrusted RDP servers. Implement network-level controls to filter malformed RDP packets. Monitor for client crashes or log entries indicating failed assertions related to surface scaling.

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