CVE-2026-125394

MEDIUM 5.4

FreeRDP before 3.33.0 Use-After-Free via Stale Brush Cache Pointer

CVSS Score

5.4

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-416
Vendor	freerdp
Product	freerdp
Published	Nov 9, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

Low

Affected Versions

FreeRDP / FreeRDP

0 < 3.33.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-fw6x-h8gw-778w github.com: https://github.com/FreeRDP/FreeRDP/commit/ffc6b976e3589b768e8e279bc61dfb7b5896e832 github.com: https://github.com/FreeRDP/FreeRDP/releases/tag/3.33.0 github.com: https://github.com/FreeRDP/FreeRDP/blob/3.32.2/libfreerdp/cache/brush.c#L80 vulncheck.com: https://www.vulncheck.com/advisories/freerdp-before-3.33.0-use-after-free-via-stale-brush-cache-pointer

Credits

dread (d7ead)