CVE-2026-125394
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Heap Use-After-Free in FreeRDP

Publication date: 2026-11-10

Last updated on: 2026-11-10

Assigner: VulnCheck

Description
FreeRDP before 3.33.0 contains a heap use-after-free vulnerability in update_gdi_patblt(), update_gdi_polygon_cb() and update_gdi_mem3blt() that retain stale brush cache pointers. A malicious RDP server can resend CACHE_BRUSH to the same slot then send PATBLT, causing clients to read freed heap memory, disclosing data or crashing.

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Meta Information

Published
2026-11-10
Last Modified
2026-11-10
Generated
2026-11-10
AI Q&A
2026-11-10
EPSS Evaluated
N/A
NVD
CVE-2026-125394
EUVD
EUVD-2026-120557

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
FreeRDP FreeRDP From 0 (inc) to 3.33.0 (exc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-416 The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

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Executive Summary

This is a heap use-after-free vulnerability in FreeRDP versions before 3.33.0. A malicious RDP server can exploit stale brush cache pointers by resending a CACHE_BRUSH command to the same slot and then sending a PATBLT command. This causes the client to read freed heap memory, potentially disclosing data or crashing the application.

Detection Guidance

To detect this vulnerability, check your FreeRDP version. Run: freerdp /v:server /cert-ignore. If the version is below 3.33.0, the system is vulnerable. Monitor logs for crashes or memory errors during RDP sessions.

Impact Analysis

The vulnerability allows a malicious RDP server to read freed memory on the client's system, which could lead to data disclosure or application crashes. It requires no special flags or privileges and can be exploited by any connected server.

Compliance Impact

This vulnerability could potentially impact compliance with GDPR and HIPAA by enabling data disclosure or application crashes during RDP sessions. A malicious server could exploit the heap use-after-free to read sensitive memory, which may include personal data protected under GDPR or protected health information under HIPAA. The resulting instability or crashes could also disrupt access to critical systems handling regulated data.

Mitigation Strategies

Upgrade FreeRDP to version 3.33.0 or later immediately. If upgrading is not possible, disable RDP sessions or restrict server connections until patched. Monitor for suspicious RDP server behavior.

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