CVE-2026-6918

HIGHNVD 7.57.5—Elevated

7.5

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.

CVSS v3: 7.5
EG Score: 7.5(medium)
EPSS: 18.2%
KEV: Not listed

Published

May 5, 2026

Last Modified

May 5, 2026

Advisory Details (2)

Auto-updated May 5, 2026

🔬 Proof of concept available. Patch available. Sources: github.

github Patch Available🟡 PoC Available

Pre-auth remote OOB heap read in JITServer Message::deserialize() via crafted DataDescriptor._size · Advisory · eclipse-openj9/openj9 · GitHub

https://github.com/eclipse-openj9/openj9/security/advisories/GHSA-q393-vr4c-969r

generic

Prevent JITServer buffer overrun by mpirvu · Pull Request #23793 · eclipse-openj9/openj9 · GitHub

https://github.com/eclipse-openj9/openj9/pull/23793

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-125Out-of-bounds Read

Data Freshness Timeline

(refreshed 12× in last 7d / 17× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-31 22:30 UTCepss_batch
2026-05-31 22:30 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-29 13:44 UTCepss_batch
2026-05-29 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-26 13:44 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-23 00:08 UTCEG score recompute
2026-05-21 22:43 UTCepss_batch
2026-05-20 22:38 UTCepss_batch
2026-05-20 14:28 UTCEG score recompute
2026-05-20 11:22 UTCepss_batch

Frequently asked(5)

What is CVE-2026-6918?

CVE-2026-6918 is a high vulnerability published on May 5, 2026. 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.

When was CVE-2026-6918 disclosed?

CVE-2026-6918 was first published in the National Vulnerability Database on May 5, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2026-6918 actively exploited?

CVE-2026-6918 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 18.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2026-6918?

CVE-2026-6918 has a CVSS v3 base score of 7.5 (NVD).

How do I remediate CVE-2026-6918?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-6918, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2026-6918

📅 Published

🔄 Last Modified

📋 Advisory Details (2)