Vulnerability in TigerVNC (CVE-2026-34352)
Summary
Vulnerability in TigerVNC (CVE-2026-34352). Confidential information can be exposed externally.
Original description
The description as published by the source.
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.
Source: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-34352 has been found in TigerVNC.
Confidential information can be exposed externally. CVSS score: 8.5/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "TigerVNC CVE-2026-34352" on the vendor's site.
CVE-2026-34352 (TigerVNC) — CWE-732 / CVSS v3 8.5
Attack vector: local / unauthenticated / no user interaction
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-732) exists in TigerVNC.
Check the vendor advisory for the affected versions of TigerVNC.
Severity: High (CVSS 8.5/10). Confidential information can be exposed externally.
Update to the patched release per vendor advisory.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'TigerVNC' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'TigerVNC' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
TigerVNCを grep し、稼働しているサービス・バージョンを把握する。 -
2Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Debian DEBIAN-CVE-2026-34352 tigervnc
- Ubuntu UBUNTU-CVE-2026-34352 tigervnc
References
- advisory cve@mitre.org
- patch cve@mitre.org
- patch cve@mitre.org
- web github.com
- web cve@mitre.org
- web nvd.nist.gov
- web github.com