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CVE-2026-107612— World-accessible IPC shared memory with predictable name 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 的权限分配错误漏洞，允许本地已认证用户读取或覆盖 TightVNC 服务与其桌面服务器进程之间使用的进程间通信（IPC）句柄。承载管道句柄值的命名共享内存段位于 Global\ 命名空间，其创建时使用了 NULL DACL（ discretionary access control list，自主访问控制列表），且该名称基于以时间为种子的 srand(time(0)) 生成值，具有可预测性，精度可达秒级。低权限的本地进

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-2026-107612

Vulnerability Information
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Vulnerability Title
World-accessible IPC shared memory with predictable name in TightVNC Server
Source: CVE Program / CVE List V5
Vulnerability Description
Incorrect permission assignment in GlavSoft TightVNC Server for Windows before 2.8.88 allows a local authenticated user to read or overwrite the inter-process communication handles used between the TightVNC service and its desktop server process. The named shared memory segment in the Global\ namespace that carries the pipe HANDLE values is created with a NULL DACL, and its name is derived from a time-seeded srand(time(0)) value that is predictable to one-second granularity. A low-privileged local process can open the mapping and tamper with the IPC channel of a service running as SYSTEM, potentially leading to disclosure of session data, privilege escalation, or denial of service.
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
关键资源的不正确权限授予
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-2026-107612

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III. Intelligence Information for CVE-2026-107612

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Vendor Pages for CVE-2026-107612 (1)

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

CVE-2026-107615 7.8 HIGH DLL search order hijacking via screenhooks libraries 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-732

V. Comments for CVE-2026-107612

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