CVE-2026-32853

Published: Mar 24, 2026 Last Modified: Mar 24, 2026
ExploitDB:
Other exploit source:
Google Dorks:
MEDIUM 6,9
Source: [email protected]
Attack Vector: network
Attack Complexity: low
Privileges Required: none
User Interaction: none
Confidentiality: N/A
Integrity: N/A
Availability: N/A

Description

AI Translation Available

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.

125

Out-of-bounds Read

Draft
Abstraction: Base Structure: Simple
Common Consequences
Security Scopes Affected:
Confidentiality Availability Other
Potential Impacts:
Read Memory Bypass Protection Mechanism Dos: Crash, Exit, Or Restart Varies By Context
Applicable Platforms
Languages: C, C++, Memory-Unsafe
Technologies: ICS/OT
View CWE Details
https://github.com/LibVNC/libvncserver/commit/009008e2f4d5a…
https://github.com/LibVNC/libvncserver/commit/009008e2f4d5a54dd71f422070df3af7b…
https://github.com/LibVNC/libvncserver/security/advisories/…
https://github.com/LibVNC/libvncserver/security/advisories/GHSA-87q7-v983-qwcj
https://www.vulncheck.com/advisories/libvncserver-ultrazip-…
https://www.vulncheck.com/advisories/libvncserver-ultrazip-encoding-heap-out-of…