CVE-2026-16440 Denial of service in Eclipse OpenJ9
Attackers can cause a segmentation fault and crash the application by providing a crafted class file with deeply nested annotations.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-16440?
CVE-2026-16440 is a medium-severity denial of service vulnerability in Eclipse OpenJ9, published on 19 Aug 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
In Eclipse OpenJ9 versions up to 0.60, a crafted .class file with deeply nested annotations causes a segmentation fault.
Weakness: CWE-674
Which versions are affected by CVE-2026-16440?
How do I fix CVE-2026-16440?
Upgrade to a fixed version.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-16440 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-16440 exists.
Sources
Also known as GHSA-ch6r-v7rg-4jqx, GHSA-jxfm-5353-qwhv.