Public proof of conceptFix available

CVE-2026-6918

Q: Is CVE-2026-6918 actively exploited?

A proof-of-concept exploit exists for CVE-2026-6918, but active exploitation has not been confirmed at this time.

Q: What is the CVSS score for CVE-2026-6918?

CVE-2026-6918 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

A public proof of concept exists; no exploitation attested.

Published2026-05-05
Fixed in0.59.0
WeaknessCWE-125 · CWE-1286

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC

2026-05-0513:16CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-6918?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-6918?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Eclipse openj9

Branch	Affected	Fixed in	Source
0.x	≥ 0.21.0, < 0.59.0	0.59.0	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update Eclipse openj9 to 0.59.0

Advisories and patches

github.comPatch
github.comVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

CISA-ADPSSVC decisionpoc2026-05-05
OpenCVESSVC decisionpoc—
CNACVSS 4.08.7read 2026-10-23
CNACVSS 3.17.5read 2026-10-23
NVDCVSS 3.17.5read 2026-10-23
CNAweakness (CWE)CWE-125, CWE-1286read 2026-10-23
FIRST EPSSEPSS score1.2 %2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 4.0 vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published: 2026-05-05
Last Modified: 2026-07-15
NVD status: Modified

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.

Is CVE-2026-6918 actively exploited?

A proof-of-concept exploit exists for CVE-2026-6918, but active exploitation has not been confirmed at this time.

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

CVE-2026-6918 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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