Out-of-bounds write in FreeRDP - CVE-2026-29775

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Main Vulnerability Database Vulnerabilities #VU125364

Out-of-bounds write in FreeRDP - CVE-2026-29775

Published: April 8, 2026


Vulnerability identifier: #VU125364
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-29775
CWE-ID: CWE-787
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.

The vulnerability exists due to out-of-bounds write in bitmap_cache_put in the bitmap cache subsystem when processing a crafted CACHE_BITMAP_ORDER (Rev1) from a malicious server. A remote attacker can send a specially crafted CACHE_BITMAP_ORDER with cacheId equal to maxCells to cause a denial of service.

The issue is client-side and can also result in a 4-byte out-of-bounds read followed by heap corruption, with potential pointer overwrite depending on heap layout.


How to mitigate CVE-2026-29775

Install security update from vendor's website.

Sources