Out-of-bounds read in FreeRDP - #VU164454
Published: November 10, 2026
Vulnerability identifier: #VU164454
CSH Severity: Low
CVSS v4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disclose client-process heap memory through generated PNG images.
The vulnerability exists due to an out-of-bounds read in FreeRDP's WinPR save_png_to_buffer() function when converting 9–16 bpp images to PNG because the selected RGB format requires more bytes per pixel than the row buffer contains. A remote attacker can supply crafted CF_DIB or CF_DIBV5 clipboard data from a malicious RDP server and have a local application request image/png to expose adjacent heap bytes in the resulting image.
Affected software
FreeRDP
Remediation
Install security update from vendor's website.
FreeRDP - update to 3.33.0