CVE-2026-44041
MEDIUMUltraVNC vncWc2Mb calls wcslen() before validating that the wide string is NUL-terminated
Title source: cnaExploitation Summary
EIP tracks 1 public exploit for CVE-2026-44041. PoCs published by HermesNA-1.
AI-analyzed exploit summary This repository contains an auto-generated stub module for CVE-2026-44041, an out-of-bounds read vulnerability in UltraVNC through 1.8.2.2. The code includes metadata and a placeholder `run()` method that explicitly states it needs actual PoC implementation, with no functional exploit logic present.
Description
UltraVNC through 1.8.2.2 contains an out-of-bounds read in the wide-string to multibyte conversion helper. In rfb/dh.cpp:204, the vncWc2Mb() function passes a caller-supplied WCHAR pointer to wcslen() before any bounds check. If the caller provides a wide-character buffer that is not properly NUL-terminated, wcslen() reads past the end of the buffer until it encounters a NUL wchar, resulting in an out-of-bounds read. Under typical Win32 API usage this requires an abnormal caller contract. Impact is limited to a potential information disclosure from adjacent memory regions or a process crash (denial of service) if the over-read crosses a page boundary.
Exploits (1)
This repository contains an auto-generated stub module for CVE-2026-44041, an out-of-bounds read vulnerability in UltraVNC through 1.8.2.2. The code includes metadata and a placeholder `run()` method that explicitly states it needs actual PoC implementation, with no functional exploit logic present.
References (3)
Scores
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L