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 crash, because of incorrect permissions.

Published: 2026-03-26 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-34352 is rated Low Risk (39.7/100): CVSS High severity, with low exploitation likelihood (EPSS 0.25%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2026-34352

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.01% 0.25% +0.24%
2 2026-03-27 — 0.01% —

Full EPSS history (2 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-34352

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.5 3.1 HIGH
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:L Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:L)
Might cause slowdowns, glitches, or partial disruption—not a full brick.
 2.5 5.3 [email protected]
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]

Weakness enumeration for CVE-2026-34352

GitHub Security Advisory for CVE-2026-34352

GHSA-4vj5-vh2w-8g5j · Severity: high — In TigerVNC before 1.16.2, Image.cxx in x0vncserver allows other users to observe or manipulate...

OS Trackers for CVE-2026-34352

vendor priority summary link
alpine — CVE-2026-34352: 1 source package rows (tigervnc); 5 state rows across 2 repos (3.23-community, edge-community); fixed 0, open 5. https://security.alpinelinux.org/vuln/CVE-2026-34352
debian not yet assigned CVE-2026-34352 not yet assigned priority: Debian including 1 source packages (tigervnc), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): open 5. https://security-tracker.debian.org/tracker/CVE-2026-34352
redhat medium — https://access.redhat.com/security/cve/CVE-2026-34352
suse high CVE-2026-34352 severity important: SUSE including 53 source package names (2.2.1-5.112:libpng16-16-1.6.43-slfo.1.1_4.1, latest:libpng16-16-1.6.43-slfo.1.1_4.1, …), 156 product×package rows across 51 product lines (Container suse/sl-micro/6.0/base-os-container, Container suse/sl-micro/6.1/base-os-container, … (51 product lines)): Fixed 151, First Fixed 5. https://www.suse.com/security/cve/CVE-2026-34352/
ubuntu medium CVE-2026-34352 medium priority: Ubuntu including 1 source packages (tigervnc), 6 status rows across 6 suites (bionic, focal, jammy, noble, questing, upstream): needs-triage 6. https://ubuntu.com/security/CVE-2026-34352

Affected software / configurations for CVE-2026-34352

Vendor Product Version Raw CPE
tigervnc tigervnc < 1.16.2 cpe:2.3:a:tigervnc:tigervnc:*:*:*:*:*:*:*:*

References for CVE-2026-34352

cvelogic Threat Intelligence