CVEvulnerability

CVE-2026-44041

6.5 MEDIUM Published 2026-07-01 Modified 2026-10-25 Official page ↗
Status
Modified
Published
2026-07-01
Last modified
2026-10-25
Assigner
33c584b5-0579-4c06-b2a0-8d8329fcab9c
CVSS 3.1 (33c584b5-0579-4c06-b2a0-8d8329fcab9c)
4.3 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
CVSS 3.1 ([email protected])
6.5 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
Weaknesses
CWE-125

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.

Affected configurations

• uvnc ultravnc (<= 1.8.2.2)

Related

Weakness · CWE (1)

  • CWE-125 Out-of-bounds Read weakness

References