CVE-2026-30040 Memory corruption in n/a
Attackers can execute arbitrary code by tricking users into opening a crafted JPEG 2000 file in FastStone Image Viewer.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-30040?
CVE-2026-30040 is a medium-severity memory corruption vulnerability in n/a, published on 26 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A heap overflow in the FSViewer.exe process of FastStone Image Viewer v8.3 allows attackers to cause a execute arbitrary code in the context of the current process via supplying a crafted JPEG 2000 (JP2) file.
Weakness: CWE-122
Which versions are affected by CVE-2026-30040?
How do I fix CVE-2026-30040?
No fix has been published for CVE-2026-30040 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-30040 being exploited?
There is no known exploitation of CVE-2026-30040 in the wild and no public exploit code.
Sources
Also known as GHSA-74rp-5fx4-84m7.