Description

LibVNCServer versions 0.9.15 and prior (fixed in commit 009008e) contain a heap out-of-bounds read vulnerability in the UltraZip encoding handler that allows a malicious VNC server to cause information disclosure or application crash. Attackers can exploit improper bounds checking in the HandleUltraZipBPP() function by manipulating subrectangle header counts to read beyond the allocated heap buffer.

INFO

Published Date :

2026-03-24T17:30:40.061Z

Last Modified :

2026-03-25T13:41:15.171Z

Source :

VulnCheck
AFFECTED PRODUCTS

The following products are affected by CVE-2026-32853 vulnerability.

Vendors Products
Libvncserver
  • Libvncserver
Libvncserver Project
  • Libvncserver
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-32853.

URL Resource
https://github.com/LibVNC/libvncserver/commit/009008e2f4d5a54dd71f422070df3af7b3dbc931 cve-icon cve-icon cve-icon
https://github.com/LibVNC/libvncserver/security/advisories/GHSA-87q7-v983-qwcj cve-icon cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-32853 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-32853 cve-icon
https://www.vulncheck.com/advisories/libvncserver-ultrazip-encoding-heap-out-of-bounds-read cve-icon cve-icon cve-icon
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CVSS Vulnerability Scoring System

Detailed values of each vector for above chart.
Attack Vector
Attack Complexity
Attack Requirements
Privileges Required
User Interaction
VS Confidentiality
VS Integrity
VS Availability
SS Confidentiality
SS Integrity
SS Availability
Detailed values of each vector for above chart.
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact