Out-of-bounds read in FreeRDP - CVE-2026-57158
Published: July 6, 2026
Vulnerability identifier: #VU136925
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-57158
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: FreeRDP
Affected software:
FreeRDP
FreeRDP
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to out-of-bounds read in planar_decompress_plane_rle_only when processing a truncated RLE planar payload in RDPGFX_CMDID_WIRETOSURFACE_1. A remote attacker can send a specially crafted WireToSurface packet with codecId=PLANAR and a payload truncated by 1 byte to cause a denial of service.
No user interaction beyond connecting to the server is required.
How to mitigate CVE-2026-57158
Install security update from vendor's website.