CVE-2026-32853
LibVNCServer UltraZip Encoding Heap Out-of-bounds Read
8.1CVSSHIGH
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 Breakdown
Exploitability
AV:NAttack VectorNetwork
AC:LAttack ComplexityLow
PR:NPrivileges RequiredNone
UI:RUser InteractionRequired
Scope
S:UScopeUnchanged
Impact
C:HConfidentialityHigh
I:NIntegrityNone
A:HAvailabilityHigh
Weaknesses
Affected Products
Attack Graph
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Exploitability
Official Patch Available
MITRE ATT&CK
1 technique Collection
References
Timeline
Published
Mar 24, 2026
Last Updated
Mar 25, 2026
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