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Vulnerability · Published Oct 8, 2026 · Assigned by securin

CVE-2026-107612World-accessible IPC shared memory with predictable name in TightVNC Server

High 7.8

In plain English

A high-severity incorrect permission assignment in TightVNC from GlavSoft. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 1% of all known vulnerabilities).

Severity (CVSS 3.1)7.8High
Exploit odds (30 days)0.1%top 99.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Ubuntu:22.04:LTStightvncno fix listedUBUNTU-CVE-2026-107612
Ubuntu:24.04:LTStightvncno fix listedUBUNTU-CVE-2026-107612
Ubuntu:26.04:LTStightvncno fix listedUBUNTU-CVE-2026-107612

Affected products (as reported)

VendorProductVersions
GlavSoft TightVNC 0 – before 2.8.88

Weakness: CWE-732, CWE-338 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References