How severe is CVE-2026-6918?

CVE-2026-6918 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-6918 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (40th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-6918?

CVE-2026-6918 affects Eclipse Openj9. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-6918?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-6918 have an EU (EUVD) identifier?

Yes. CVE-2026-6918 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-27315.

When was CVE-2026-6918 published?

CVE-2026-6918 was published on 2026-05-05 and last updated on 2026-06-30.

CVE-2026-6918

CVE-2026-6918 is a high-severity vulnerability in Eclipse Openj9 with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-125.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v4: 8.7
EPSS exploit prediction: 1% (40th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-27315
Weakness: CWE-125
Affected product: Eclipse Openj9
Published: 2026-05-05
Last modified: 2026-06-30

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-6918?: CVE-2026-6918 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-6918 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (40th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-6918?: CVE-2026-6918 affects Eclipse Openj9. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-6918?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-6918 have an EU (EUVD) identifier?: Yes. CVE-2026-6918 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-27315.
When was CVE-2026-6918 published?: CVE-2026-6918 was published on 2026-05-05 and last updated on 2026-06-30.

References

Affected products (1)

cpe:2.3:a:eclipse:openj9:*:*:*:*:*:*:*:*

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