Heap-based buffer overflow in FreeRDP - #VU164446
Published: November 10, 2026
Vulnerability identifier: #VU164446
CSH Severity: High
CVSS v4: 8.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to corrupt heap memory and cause a denial of service in applications using FreeRDP's H.264 codec.
The vulnerability exists due to a heap-based buffer overflow in FreeRDP's H.264 buffer management when h264_context_reset() updates dimensions before yuv_ensure_buffer() checks whether reallocation is necessary. A remote attacker can request a surface height increase without changing its width on servers supporting client-requested resizing, causing subsequent frame conversion to overwrite undersized YUV planes and corrupt adjacent heap memory.
Affected software
FreeRDP
Remediation
Install security update from vendor's website.
FreeRDP - update to 3.33.0