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Vulnerability record · CVE-2026-6918 · published 5 May 2026

CVE-2026-6918: Eclipse openj9 out-of-bounds read vulnerability

Eclipse · Openj9

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.

8.7 CVSS 4.0 High EPSS 1.2% · top 33.6% CWE-125 · Out-of-bounds readCWE-1286 · CWE-1286
8.7CVSS 4.0 base score
1.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
7References, 2 tagged exploit
15 Jul 2026Last modified by NVD

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.

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:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/eclipse-openj9/openj9/pull/23793 Issue TrackingPatch
https://github.com/eclipse-openj9/openj9/security/advisories/GHSA-q393-vr4c-969r ExploitVendor Advisory
https://access.redhat.com/errata/RHSA-2026:22328
https://access.redhat.com/security/cve/CVE-2026-6918
https://bugzilla.redhat.com/show_bug.cgi?id=2466741
https://github.com/eclipse-openj9/openj9/security/advisories/GHSA-q393-vr4c-969r ExploitVendor Advisory
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-6918.json

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2021-41035Eclipse openj9 execution with unnecessary privileges vulnerabilityIn Eclipse Openj9 before version 0.29.0, the JVM does not throw IllegalAccessError for MethodHandles that invoke inaccessible interface methods.EPSS 1.8%9.8CVE-2020-27221Eclipse openj9 stack-based buffer overflow vulnerabilityIn Eclipse OpenJ9 up to and including version 0.23, there is potential for a stack-based buffer overflow when the virtual machine or JNI natives are …EPSS 1.5%9.8CVE-2019-11772Eclipse openj9 out-of-bounds write vulnerabilityIn Eclipse OpenJ9 prior to 0.15, the String.getBytes(int, int, byte[], int) method does not verify that the provided byte array is non-null nor that …EPSS 2.1%9.8CVE-2018-12547Eclipse openj9 improper input validation vulnerabilityIn Eclipse OpenJ9, prior to the 0.12.0 release, the jio_snprintf() and jio_vsnprintf() native methods ignored the length parameter. This affects exis…EPSS 2.7%9.8CVE-2018-12549Eclipse openj9 improper input validation vulnerabilityIn Eclipse OpenJ9 version 0.11.0, the OpenJ9 JIT compiler may incorrectly omit a null check on the receiver object of an Unsafe call when acceleratin…EPSS 2.3%9.8CVE-2018-12548Eclipse openj9 memory buffer overflow vulnerabilityIn OpenJDK + Eclipse OpenJ9 version 0.11.0 builds, the public jdk.crypto.jniprovider.NativeCrypto class contains public static natives which accept p…EPSS 1.1%9.1CVE-2023-2597Eclipse openj9 classic buffer overflow vulnerabilityIn Eclipse Openj9 before version 0.38.0, in the implementation of the shared cache (which is enabled by default in OpenJ9 builds) the size of a strin…EPSS 0.43%9.1CVE-2019-17631Eclipse openj9 improper authorization vulnerabilityFrom Eclipse OpenJ9 0.15 to 0.16, access to diagnostic operations such as causing a GC or creating a diagnostic file are permitted without any privil…EPSS 2.1%

Source: NIST National Vulnerability Database (record CVE-2026-6918), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.