Out-of-bounds Read in Eclipse Openj9
CVE-2026-6918
In Eclipse Open9J versions 0.21 to 0.58, a pre-authentication remote attacker can crash JITServer by sending a 32-byte crafted TCP message.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.012 (67.2th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 67th percentile — 67.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.012 · change: +0.007
Affected products
- Eclipse Openj9
- Eclipse Foundation Openj9 — versions 0.21
Weakness classification (CWE)
References
- github.com/eclipse-openj9/openj9/pull/23793 (Patch, Issue Tracking)
- github.com/eclipse-openj9/openj9/security/advisories/GHSA-q393-vr4c-969r (Exploit, Vendor Advisory)
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Frequently asked questions
- What is CVE-2026-6918?
- CVE-2026-6918 is a high-severity vulnerability in Eclipse Openj9, classified under Out-of-bounds Read. CVSS score: 7.5/10. Published 2026-05-05.
- How severe is CVE-2026-6918?
- High severity. CVSS v3 base score is 7.5 out of 10.