CVE-2026-32853

· HIGHAnalyzed

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CVSS v3.1

8.1

CVSS v4.0

6.9

EPSS

0.44%

Published

Mar 24, 2026

Modified

Mar 25, 2026

Public PoC / Exploit (1)

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Links to public security research (Exploit-DB, Nuclei, Trickest, GitHub) for defensive use only.

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.

CVSS Vector

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

Weaknesses (CWE)

CWE-125

Affected Products (1)

libvncserver_project · libvncserver (up to 0.9.15)vulnerable

References (4)

https://github.com/LibVNC/libvncserver/commit/009008e2f4d5a54dd71f422070df3af7b3dbc931

Patch

https://github.com/LibVNC/libvncserver/security/advisories/GHSA-87q7-v983-qwcj

Vendor Advisory

https://www.vulncheck.com/advisories/libvncserver-ultrazip-encoding-heap-out-of-bounds-read

ExploitVendor Advisory

https://github.com/LibVNC/libvncserver/security/advisories/GHSA-87q7-v983-qwcj

Vendor Advisory

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