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CVE-2026-32853

Published: Mar 24, 2026

Modified: Mar 25, 2026

PUBLISHED

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.

Vendor	Product	Versions
LibVNC	LibVNCServer	affected `0 - <= 0.9.15` unaffected `009008e2f4d5a54dd71f422070df3af7b3dbc931`

Weaknesses (CWE)

References

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

vendor-advisory

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

patch

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

third-party-advisory

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