All vulnerabilities
CVE-2026-101203

FastStone Image Viewer 1bpp RLE Decoder out-of-bounds write

FastStone Image Viewer
Open in ThreatlineRecord JSON
CVSS
5.3Medium
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.23%Chance of exploitation activity in the next 30 days, higher than 13% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
Published28 Sep 2026Updated 29 Sep 2026CVE List

What fixes it

No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.

Description

A vulnerability has been found in FastStone Image Viewer up to 8.3. The impacted element is an unknown function of the component 1bpp RLE Decoder. The manipulation leads to out-of-bounds write. The attack can be initiated remotely. The vendor was contacted early about this disclosure but did not respond in any way.

Text from CVE List

Affected versions 4

  • Image Vieweraffected: 8.0CVE List
  • Image Vieweraffected: 8.1CVE List
  • Image Vieweraffected: 8.2CVE List
  • Image Vieweraffected: 8.3CVE List

References 4