TigerVNC up to 1.16.1 x0vncserver Image.cxx permission assignment

CVSS Meta Temp Score
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CTI Interest Score
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6.8$0-$5k0.43

Summaryinfo

A vulnerability was found in TigerVNC up to 1.16.1. It has been classified as problematic. This impacts an unknown function of the file Image.cxx of the component x0vncserver. The manipulation leads to permission assignment. This vulnerability is listed as CVE-2026-34352. The attack must be carried out locally. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in TigerVNC up to 1.16.1 and classified as problematic. This issue affects an unknown code block of the file Image.cxx of the component x0vncserver. The manipulation with an unknown input leads to a permission assignment vulnerability. Using CWE to declare the problem leads to CWE-732. The product specifies permissions for a security-critical resource in a way that allows that resource to be read or modified by unintended actors. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

In TigerVNC before 1.16.2, Image.cxx in x0vncserver allows other users to observe or manipulate the screen contents, or cause an application crash, because of incorrect permissions.

The advisory is shared at openwall.com. The identification of this vulnerability is CVE-2026-34352 since 03/26/2026. The exploitation is known to be easy. An attack has to be approached locally. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 305835 (openSUSE 16 Security Update : tigervnc (openSUSE-SU-2026:20465-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 1.16.2 eliminates this vulnerability. Applying the patch 0b5cab169d847789efa54459a87659d3fd484393 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (305835) and CERT Bund (WID-SEC-2026-0888). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Affected

  • Open Source tigervnc

Productinfo

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.9
VulDB Meta Temp Score: 6.8

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 8.5
CNA Vector (MITRE): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Permission assignment
CWE: CWE-732 / CWE-275 / CWE-266
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 305835
Nessus Name: openSUSE 16 Security Update : tigervnc (openSUSE-SU-2026:20465-1)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: TigerVNC 1.16.2
Patch: 0b5cab169d847789efa54459a87659d3fd484393

Timelineinfo

03/26/2026 CVE reserved
03/27/2026 +1 days Advisory disclosed
03/27/2026 +0 days VulDB entry created
04/10/2026 +14 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: openwall.com
Status: Confirmed

CVE: CVE-2026-34352 (🔒)
GCVE (CVE): GCVE-0-2026-34352
GCVE (VulDB): GCVE-100-353813
CERT Bund: WID-SEC-2026-0888 - tigervnc: Schwachstelle ermöglicht Offenlegung von Informationen, Manipulation von Dateien, und Denial of Service

Entryinfo

Created: 03/27/2026 07:25
Updated: 04/10/2026 20:54
Changes: 03/27/2026 07:25 (65), 03/28/2026 04:46 (7), 04/10/2026 20:54 (2)
Complete: 🔍
Cache ID: 216:B98:103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Discussion

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