CVE-2026-34352
Description
A flaw was found in TigerVNC's x0vncserver component. Due to incorrect permissions in the Image.cxx file, other users on the system can observe or manipulate the screen contents of a running session. This vulnerability could also lead to an application crash, resulting in a Denial of Service (DoS).
Mitigation
The x0vncserver component should be disabled if not actively required. If x0vncserver is necessary, ensure that only trusted users have access to the system where it is running. To disable the x0vncserver service, if it is running as a systemd service, you can use: `sudo systemctl stop x0vncserver.service` `sudo systemctl disable x0vncserver.service` If x0vncserver is launched manually, avoid running it in multi-user environments. A service restart or system reboot may be required for changes to take full effect.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 6.3 | 9.8 | 8.5 |
| Attack Vector | Local | Network | Local |
| Attack Complexity | Low | Low | Low |
| Privileges Required | Low | None | None |
| User Interaction | None | None | None |
| Scope | Changed | Unchanged | Changed |
| Confidentiality | Low | High | High |
| Integrity Impact | Low | High | Low |
| Availability Impact | Low | High | Low |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L
NVD: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
cve.org: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:L
Understanding the Weakness (CWE)
Confidentiality,Integrity
Technical Impact: Read Application Data; Modify Application Data
Frequently Asked Questions
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