# CVE-2026-101202: FastStone Image Viewer out-of-bounds write in TGA handler

Source: https://junglewise.ai/threats/cve-2026-101202-a-flaw-has-been-found-in-faststone-image-viewer-up-to-8-3-the  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-28. Updated: 2026-09-28  
License: CC BY 4.0 with a link back

CVE-2026-101202 · Severity: medium · CVSS 6.3 · Published 2026-09-28

FastStone Image Viewer is a desktop application for viewing and editing images. A flaw in its TGA image file handler allows an attacker to remotely cause an out-of-bounds memory write by opening a malicious TGA file, potentially leading to application crash or code execution. The vendor has not provided a fix despite early notification of the vulnerability.

Technologies: [Faststone Image Viewer](https://junglewise.ai/threats/technologies/image-viewer). Vendors: [Faststone](https://junglewise.ai/threats/vendors/faststone).

## Quick answers

**Is CVE-2026-101202 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-101202 being exploited in the wild.

**How severe is CVE-2026-101202?** Medium severity, with a CVSS score of 6.3, published 28 September 2026.

**Which products and versions are affected?** Faststone Image Viewer up to 8.3.

**Is there a fix for CVE-2026-101202?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-101202 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-101202?** Check whether you run Faststone Image Viewer at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

An out-of-bounds write vulnerability exists in the TGA image handler component of FastStone Image Viewer versions up to 8.3. The attack requires only remote network delivery of a crafted TGA file and can be triggered through user interaction (opening the malicious file). Successful exploitation could result in denial of service or arbitrary code execution.

## Affected products

- FastStone Image Viewer up to 8.3

## Timeline

- 2026-09-28: disclosed

## References

- [https://vuldb.com/cve/CVE-2026-101202](https://vuldb.com/cve/CVE-2026-101202)
- [https://vuldb.com/submit/907574](https://vuldb.com/submit/907574)

## Related threats

- [FastStone Image Viewer out-of-bounds read in Box-Average Downsampler](https://junglewise.ai/threats/cve-2026-116463-a-vulnerability-was-identified-in-faststone-image-viewer-up-to-8)
- [FastStone Image Viewer out-of-bounds read in PCX decoder](https://junglewise.ai/threats/cve-2026-101205-a-vulnerability-was-determined-in-faststone-image-viewer-up-to-8)
- [FastStone Image Viewer out-of-bounds read in TGA handler](https://junglewise.ai/threats/cve-2026-101204-a-vulnerability-was-found-in-faststone-image-viewer-up-to-8-3)
- [FastStone Image Viewer out-of-bounds write in 1bpp RLE decoder](https://junglewise.ai/threats/cve-2026-101203-a-vulnerability-has-been-found-in-faststone-image-viewer-up-to-8)
- [FastStone Image Viewer integer overflow in PSD parser](https://junglewise.ai/threats/cve-2026-30041-faststone-image-viewer-integer-overflow-in-psd-parser)