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Affected Component
Analysis
libvncserver
Patched
Name
CVE-2026-32853
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.
CWEs
Published Date
Updated Date
Workaround
-
Advisories
Analysis#
Vulnerability Ratings#
6.9
CVSSv4
8.1
CVSSv31
NaN
other
Others affected components#
Resolved with patches#
libvncserver (buildroot:2025.02.x)
#
Title
Author
Resolve
1
libvncclient: add bounds checks to UltraZip subrectangle
Kazuma Matsumoto <269371721+y637F9QQ2x@users.noreply.github.com>
CVE-2026-32853
libvncserver (buildroot:master)
#
Title
Author
Resolve
1
libvncclient: add bounds checks to UltraZip subrectangle
Kazuma Matsumoto <269371721+y637F9QQ2x@users.noreply.github.com>
CVE-2026-32853
libvncserver (yocto:scarthgap)
#
Title
Author
Resolve
1
libvncclient: add bounds checks to UltraZip subrectangle
Kazuma Matsumoto <269371721+y637F9QQ2x@users.noreply.github.com>
CVE-2026-32853