CVE-2026-101203— FastStone Image Viewer 1bpp RLE Decoder out-of-bounds write
Quick assessment
Affected
FastStone Image Viewer
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
在 FastStone Image Viewer（版本最高至 8.3）中发现了一个漏洞。受影响的部分是组件“1bpp RLE 解码器”中的一个未知函数。该漏洞的利用可导致越界写入（out-of-bounds write）。攻击者可以远程发起攻击。供应商在早期已被联系关于此漏洞的披露事宜，但没有任何回应。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-101203
Vulnerability Information
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Vulnerability Title
FastStone Image Viewer 1bpp RLE Decoder out-of-bounds write
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| FastStone | Image Viewer | 8.0 |
cpe:2.3:a:faststone:image_viewer:*:*:*:*:*:*:*:*
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II. Public POCs for CVE-2026-101203
| # | POC Description | Source Link | Shenlong Link |
|---|
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News Coverage for CVE-2026-101203 (1)
Other References for CVE-2026-101203 (3)
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https://vuldb.com/cve/CVE-2026-101203 third-party-advisory
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https://vuldb.com/submit/907575 third-party-advisory
Same Patch Batch · FastStone · 2026-09-28 · 3 CVEs total
| CVE-2026-101202 | 6.3 MEDIUM | FastStone Image Viewer TGA Image out-of-bounds write |
| CVE-2026-101204 | 6.3 MEDIUM | FastStone Image Viewer TGA Image FSViewer.exe out-of-bounds |
IV. Related Vulnerabilities
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Same weakness: CWE-787
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V. Comments for CVE-2026-101203
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