CVE-2026-107611 GlavSoft TightVNC Viewer - Out-of-Bounds Read

GlavSoft TightVNC Viewer for Windows < 2.8.88 contains an out-of-bounds read vulnerability caused by improper validation of palette indices in the ZRLE decoder, letting malicious VNC servers read heap memory and crash the viewer remotely, exploit requires a malicious or compromised VNC server.

CVSS base score 7.1 /10
High
CISA KEV
Not listed
Public exploit
None known
EPSS
0.24% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Out-of-Bounds Read
Impact
Denial Of Service, Information Disclosure
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
Published
8 October 2026
Updated
15 October 2026
Weakness
CWE-125

Vendor fix

Update to version 2.8.88 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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