GlavSoft TightVNC up to 2.8.87 DLL Loading screenhooks32.dll DynamicLibrary::init uncontrolled search path

Summaryinfo

A vulnerability classified as critical has been found in GlavSoft TightVNC up to 2.8.87. This vulnerability affects the function DynamicLibrary::init of the file screenhooks32.dll of the component DLL Loading. Performing a manipulation results in uncontrolled search path. This vulnerability is reported as CVE-2026-107615. The attack requires a local approach. No exploit exists. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in GlavSoft TightVNC up to 2.8.87. This affects the function DynamicLibrary::init of the file screenhooks32.dll of the component DLL Loading. The manipulation with an unknown input leads to a uncontrolled search path vulnerability. CWE is classifying the issue as CWE-427. The product uses a fixed or controlled search path to find resources, but one or more locations in that path can be under the control of unintended actors. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

An uncontrolled search path element vulnerability in GlavSoft TightVNC Server for Windows before 2.8.88 allows a local authenticated user to execute arbitrary code with SYSTEM privileges. DynamicLibrary::init() (and ThemeLib) load screenhooks32.dll / screenhooks64.dll with LoadLibrary() using a bare file name and no LOAD_LIBRARY_SEARCH_* flags, so the TightVNC service follows the default DLL search order and loads an attacker-planted DLL from a writable directory earlier in that order (for example, an installation directory with permissive ACLs).

It is possible to read the advisory at sourceforge.net. This vulnerability is uniquely identified as CVE-2026-107615 since 10/08/2026. The exploitability is told to be difficult. Attacking locally is a requirement. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1574 according to MITRE ATT&CK.

Upgrading to version 2.8.88 eliminates this vulnerability.

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Productinfo

Vendor

• GlavSoft

Name

• TightVNC

Version

• 2.8.0
• 2.8.1
• 2.8.2
• 2.8.3
• 2.8.4
• 2.8.5
• 2.8.6
• 2.8.7
• 2.8.8
• 2.8.9
• 2.8.10
• 2.8.11
• 2.8.12
• 2.8.13
• 2.8.14
• 2.8.15
• 2.8.16
• 2.8.17
• 2.8.18
• 2.8.19
• 2.8.20
• 2.8.21
• 2.8.22
• 2.8.23
• 2.8.24
• 2.8.25
• 2.8.26
• 2.8.27
• 2.8.28
• 2.8.29
• 2.8.30
• 2.8.31
• 2.8.32
• 2.8.33
• 2.8.34
• 2.8.35
• 2.8.36
• 2.8.37
• 2.8.38
• 2.8.39
• 2.8.40
• 2.8.41
• 2.8.42
• 2.8.43
• 2.8.44
• 2.8.45
• 2.8.46
• 2.8.47
• 2.8.48
• 2.8.49
• 2.8.50
• 2.8.51
• 2.8.52
• 2.8.53
• 2.8.54
• 2.8.55
• 2.8.56
• 2.8.57
• 2.8.58
• 2.8.59
• 2.8.60
• 2.8.61
• 2.8.62
• 2.8.63
• 2.8.64
• 2.8.65
• 2.8.66
• 2.8.67
• 2.8.68
• 2.8.69
• 2.8.70
• 2.8.71
• 2.8.72
• 2.8.73
• 2.8.74
• 2.8.75
• 2.8.76
• 2.8.77
• 2.8.78
• 2.8.79
• 2.8.80
• 2.8.81
• 2.8.82
• 2.8.83
• 2.8.84
• 2.8.85
• 2.8.86
• 2.8.87

CPE 2.3info

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