CVE-2026-23531

freerdp: FreeRDP: Heap buffer overflow via crafted RDPGFX surface updates leads to denial of service and potential code execution.

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Severity

Important

Red Hat Product Security

7.6

CVSS 3.1

Review impact separately from score.

Published · January 20, 2026

Updated · June 30, 2026

Description

A flaw was found in FreeRDP. A malicious server can exploit an out-of-bounds read/write vulnerability in the ClearCodec component by sending crafted RDPGFX surface updates. This can trigger a client-side heap buffer overflow, leading to a crash (Denial of Service (DoS)) and potential heap corruption with a risk of arbitrary code execution. For this vulnerability to be exploited, a client must connect to a maliciously-configured server.

Statement

For this vulnerability to be exploited, a client must connect to a maliciously-configured server. Red Hat recommends that FreeRDP clients are only used to connect to trusted servers.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 7.6
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H

CWE-122 · Heap-based Buffer Overflow