CVE-2026-107611: CWE-125 Out-of-bounds Read in GlavSoft TightVNC
Description
An out-of-bounds read vulnerability in the ZRLE decoder of GlavSoft TightVNC Viewer for Windows before 2.8.88 allows a malicious or compromised VNC server to read heap memory beyond the palette allocation and crash the viewer by sending ZRLE-encoded tiles whose palette indices exceed the declared palette size. readPaletteRleTile() and readPackedPaletteTile() use the attacker-supplied index to look up colours without validating it against the palette size; out-of-bounds heap data is copied into the framebuffer (garbled display) or the read faults, terminating the viewer.
CVSS v3.1
Score 7.1high
Affected software
GlavSoft
TightVNC
Weaknesses
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- securin
- Date Reserved
- 2026-10-08T13:23:07.677Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ac7a2d82cdf04f6561cce96
Added to database: 10/08/2026, 14:04:08 UTC
Last updated: 10/08/2026, 14:04:08 UTC
Views: 1
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