CVE-2026-16439 Eclipse OpenJ9 : Using -Xtrace to trace method arguments can lead to buffer underflow

Medium 5.8 Published 21 Jul 2026 Updated 22 Jul 2026

Attackers can trigger a buffer underflow in Eclipse OpenJ9 by using the -Xtrace option to trace method arguments, potentially leading to code execution or crashes.

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-2026-16439?

CVE-2026-16439 is a medium-severity memory corruption vulnerability in Eclipse Foundation OpenJ9, published on 21 Jul 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, using -Xtrace to trace method arguments can lead to buffer underflow.

Weakness: CWE-124

Which versions are affected by CVE-2026-16439?

It affects 1 product.

Products include Eclipse Openj9.

How do I fix CVE-2026-16439?

Upgrade to a fixed version.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2026-16439 being exploited?

There is no known exploitation of CVE-2026-16439 in the wild and no public exploit code.

Sources

Also known as GHSA-pw53-4wcc-wm6v.