What’s Vulnerable › Vulnerabilities

CVE-2026-101203: FastStone Image Viewer 1bpp RLE Decoder out-of-bounds write

• Severity: medium (CVSS 6.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-28 · updated 2026-09-29
• Weakness: CWE-119

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.

Affected products

• FastStone Image Viewer: 8.0, 8.1, 8.2, 8.3

References

• https://vuldb.com/cve/CVE-2026-101203
• https://vuldb.com/submit/907575
• https://vuldb.com/vuln/411012
• https://vuldb.com/vuln/411012/cti

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