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Vulnerability record · CVE-2026-34352 · published 26 March 2026

CVE-2026-34352: Tigervnc incorrect permission assignment vulnerability

Tigervnc · Tigervnc

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.

9.8 CVSS 3.1 Critical EPSS 0.42% · top 66.3% CWE-732 · Incorrect permission assignment
9.8CVSS 3.1 base score
0.42%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/TigerVNC/tigervnc/commit/0b5cab169d847789efa54459a87659d3fd484393 Patch
https://github.com/TigerVNC/tigervnc/issues/2079
https://groups.google.com/g/tigervnc-announce/c/anHL9WLshLI Mailing ListPatch
https://sourceforge.net/projects/tigervnc/files/stable/1.16.2 Release Notes
https://www.openwall.com/lists/oss-security/2026/03/26/7 Mailing ListThird Party Advisory
https://github.com/TigerVNC/tigervnc/issues/2079

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2014-0011Tigervnc out-of-bounds write vulnerabilityMultiple heap-based buffer overflows in the ZRLE_DECODE function in common/rfb/zrleDecode.h in TigerVNC before 1.3.1, when NDEBUG is enabled, allow r…EPSS 2.5%9.8CVE-2017-5581Tigervnc memory buffer overflow vulnerabilityBuffer overflow in the ModifiablePixelBuffer::fillRect function in TigerVNC before 1.7.1 allows remote servers to execute arbitrary code via an RRE m…EPSS 4.2%9.8CVE-2014-8241Tigervnc null pointer dereference vulnerabilityXRegion in TigerVNC allows remote VNC servers to cause a denial of service (NULL pointer dereference) by leveraging failure to check a malloc return …EPSS 3.1%8.8CVE-2017-7393Tigervnc double free vulnerabilityIn TigerVNC 1.7.1 (VNCSConnectionST.cxx VNCSConnectionST::fence), an authenticated client can cause a double free, leading to denial of service or po…EPSS 1.8%8.1CVE-2020-26117Tigervnc improper certificate validation vulnerabilityIn rfb/CSecurityTLS.cxx and rfb/CSecurityTLS.java in TigerVNC before 1.11.0, viewers mishandle TLS certificate exceptions. They store the certificate…EPSS 3.1%7.8CVE-2025-26599Tigervnc vulnerabilityAn access to an uninitialized pointer flaw was found in X.Org and Xwayland. The function compCheckRedirect() may fail if it cannot allocate the backi…EPSS 0.40%7.8CVE-2025-26600Tigervnc use after free vulnerabilityA use-after-free flaw was found in X.Org and Xwayland. When a device is removed while still frozen, the events queued for that device remain while th…EPSS 0.39%7.8CVE-2025-26601Tigervnc use after free vulnerabilityA use-after-free flaw was found in X.Org and Xwayland. When changing an alarm, the values of the change mask are evaluated one after the other, chang…EPSS 0.39%

Source: NIST National Vulnerability Database (record CVE-2026-34352), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.