High severity · published May 5, 2026
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
7.5
CVSS
0.5%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 44% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
EO
Eclipse OpenJ9 · Eclipse Foundation
0.21 before 0.59 · source: vendor
OP
Openj9 · Eclipse
0.21.0 before 0.59.0 · source: NVD
RH
Red Hat Enterprise Linux 10 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Enterprise Linux 10.0 Extended Update Support · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Enterprise Linux 10.2 Extended Update Support · Red Hat
All versions, or not specified · source: CISA
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-6918
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-6918
Issue Tracking
https://github.com/eclipse-openj9/openj9/pull/23793
Exploit
https://github.com/eclipse-openj9/openj9/security/advisories/GHSA-q393-vr4c-969r
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:22328
access.redhat.com
https://access.redhat.com/security/cve/CVE-2026-6918
bugzilla.redhat.com
https://bugzilla.redhat.com/show_bug.cgi?id=2466741
security.access.redhat.com
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-6918.json
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