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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-107612
StatePUBLISHED
Assignersecurin
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-08 14:16:49 UTC
Updated2026-10-08 15:17:45 UTC
DescriptionIncorrect 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 33c584b5-0579-4c06-b2a0-8d8329fcab9c

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Problem Types: CWE-338 | CWE-732 | CWE-732 CWE-732 Incorrect Permission Assignment for Critical Resource | CWE-338 CWE-338 Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)

VersionSourceTypeScoreSeverityVector
3.133c584b5-0579-4c06-b2a0-8d8329fcab9cSecondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNACVSS7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA GlavSoft TightVNC affected 2.8.88 custom Windows

References

ReferenceSourceLinkTags
sourceforge.net/p/vnc-tight/bugs/1658 33c584b5-0579-4c06-b2a0-8d8329fcab9c sourceforge.net
www.tightvnc.com/whatsnew.php 33c584b5-0579-4c06-b2a0-8d8329fcab9c www.tightvnc.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Arjun Basnet from Securin (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-05-30T00:00:00.000ZReported to GlavSoft
CNA2026-06-02T00:00:00.000ZVendor acknowledged
CNA2026-06-19T00:00:00.000ZTightVNC 2.8.88 released with fix

Solutions

CNA: Upgrade TightVNC for Windows to version 2.8.88 or later.

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