Quick answers
- Is CVE-2026-116463 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-116463 being exploited in the wild.
- How severe is CVE-2026-116463?
- Medium severity, with a CVSS score of 6.3, published 26 October 2026.
- Which products and versions are affected?
- Faststone Image Viewer up to 8.5.
- Is there a fix for CVE-2026-116463?
- 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-2026-116463 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-116463?
- 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 read vulnerability exists in the FUN_0062d96c function of FastStone Image Viewer's Box-Average Downsampler Engine. The flaw can be exploited remotely via a maliciously crafted image file without requiring authentication or user interaction beyond opening the file. A successful exploit allows an attacker to read arbitrary memory regions.
Affected products
- FastStone Image Viewer up to 8.5
Timeline
- 2026-10-26: disclosed