CVE-2026-32853

A flaw was found in LibVNCServer. A malicious VNC server can exploit an improper bounds checking vulnerability in the UltraZip encoding handler, specifically within the HandleUltraZipBPP function. By manipulating subrectangle header counts, an attacker can read beyond the allocated memory buffer...

CVE-2026-32853 LibVNCServer UltraZip Encoding Heap Out-of-bounds Read

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...