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TI-2021-08097 Aliases CVE-2021-26236GHSA-h82r-pj6q-vp4f

FastStone Image Viewer v.<= 7.5 is affected by a Stack-based Buffer Overflow at…

Priority LOW 38CWE-787Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-787 and the CVSS impact.

Summary

FastStone Image Viewer v.<= 7.5 is affected by a Stack-based Buffer Overflow at 0x005BDF49, affecting the CUR file parsing functionality (BITMAPINFOHEADER Structure, 'BitCount' file format field), that will end up corrupting the Structure Exception Handler (SEH). Attackers could exploit this issue to achieve code execution when a user opens or views a malformed/specially crafted CUR file.

Why it matters now

EPSS 0.01968 80th percentileScored 2026-11-07
Public exploit Yes 3 exploit referencesTagged by NVD
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:faststone:image_viewer:*:*:*:*:*:*:*:*up to 7.5VulnerableFastStone
  • cpe:2.3:a:faststone:image_viewer:*:*:*:*:*:*:*:* Versions up to 7.5 Vulnerable ·FastStone

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-26236
  2. 2026-10-03 Alias added: GHSA-h82r-pj6q-vp4f

References

Exploit 3

  • TI-2007-01864 Integer overflow in FastStone Image Viewer 2.9 allows context-dependent attackers to… CVSS 2.0HIGH 9.3
  • TI-2022-17153 Unsafe Parsing of a PNG tRNS chunk in FastStone Image Viewer through 7.5 results in a stack buffer overflow. CVSS 3.1CRITICAL 9.8
  • TI-2021-08098 FastStone Image Viewer <= 7.5 is affected by a user mode write access violation at… CVSS 3.1HIGH 7.8
  • TI-2024-08464 Out-of-bounds write in FastStone Image Viewer CVSS 3.1HIGH 7.8
  • TI-2024-08463 Out-of-bounds write in FastStone Image Viewer CVSS 3.1HIGH 7.8
  • TI-2024-08462 Out-of-bounds write in FastStone Image Viewer CVSS 3.1HIGH 7.8
See all 31 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences