Out-of-bounds read in FreeRDP - #VU137839

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Main Vulnerability Database Vulnerabilities #VU137839

Out-of-bounds read in FreeRDP - #VU137839

Published: July 16, 2026


Vulnerability identifier: #VU137839
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: N/A
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vendor: FreeRDP
Affected software:
FreeRDP

Detailed vulnerability description

The vulnerability allows a remote attacker to cause a denial of service or disclose sensitive information.

The vulnerability exists due to an out-of-bounds read in the async update message proxy for PolygonCB orders when processing crafted primary drawing orders from a malicious RDP server with AsyncUpdate enabled. A remote attacker can send a specially crafted PolygonCB update order to cause a denial of service or disclose sensitive information.

The issue affects the client side and requires AsyncUpdate to be enabled.


Remediation

Install security update from vendor's website.

Sources