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CVE-2026-107615— DLL search order hijacking via screenhooks libraries in TightVNC Server

Quick assessment

Affected
GlavSoft TightVNC
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

GlavSoft TightVNC Server for Windows 版本低于 2.8.88 中存在一个不受控的搜索路径元素漏洞，允许本地认证用户以 SYSTEM 权限执行任意代码。DynamicLibrary::init()（以及 ThemeLib）函数使用 LoadLibrary() 函数加载 screenhooks32.dll / screenhooks64.dll 时，仅使用了裸文件名，而未指定 LOAD_LIBRARY_SEARCH_* 标志。因此，TightVNC 服务遵循默认的 DLL 搜索顺序，

CVSS 7.8 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
GlavSoft TightVNC < 2.8.88 affected
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I. Basic Information for CVE-2026-107615

Vulnerability Information
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Vulnerability Title
DLL search order hijacking via screenhooks libraries in TightVNC Server
Source: CVE Program / CVE List V5
Vulnerability Description
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).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对搜索路径元素未加控制
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
GlavSoft TightVNC 0 ~ 2.8.88 -

II. Public POCs for CVE-2026-107615

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III. Intelligence Information for CVE-2026-107615

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Vendor Pages for CVE-2026-107615 (1)

Same Patch Batch · GlavSoft · 2026-10-08 · 5 CVEs total

CVE-2026-107612 7.8 HIGH World-accessible IPC shared memory with predictable name in TightVNC Server
CVE-2026-107611 7.1 HIGH Out-of-bounds read in TightVNC Viewer ZRLE palette decoding
CVE-2026-107614 6.1 MEDIUM Integer underflow in TightVNC Server cursor shape trimming leads to out-of-bounds read
CVE-2026-107613 5.9 MEDIUM NULL pointer dereference in TightVNC Server Win8ScreenDriver after failed DXGI re-initiali

IV. Related Vulnerabilities

Same product: TightVNC
Same vendor: GlavSoft
Same weakness: CWE-427

V. Comments for CVE-2026-107615

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