Vulnerability in Eclipse Openj9

CVE-2026-16439

In Eclipse OpenJ9 versions up to 0.60, using -Xtrace to trace method arguments can lead to buffer underflow.

EPSS: 0.002 (14.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H.

Affected products

Eclipse Openj9
Eclipse Foundation Openj9 — versions 0.8.0, 0, 0.60.0

Weakness classification (CWE)

CWE-124 — Buffer Underwrite

References

emo@eclipse.org (Patch, Issue Tracking)
emo@eclipse.org (Broken Link)

Frequently asked questions

What is CVE-2026-16439?: CVE-2026-16439 is a critical-severity vulnerability in Eclipse Openj9, classified under Buffer Underwrite. CVSS score: 9.1/10. Published 2026-07-21.
How severe is CVE-2026-16439?: Critical severity. CVSS v3 base score is 9.1 out of 10.