SB2026051152 - Remote denial of service in Eclipse OpenJ9

Description

This security bulletin contains information about 1 vulnerability.

1) Out-of-bounds read (CVE-ID: CVE-2026-6918)

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to out-of-bounds read in Message::deserialize() and MessageBuffer::readData() when processing a crafted TCP message containing an attacker-controlled DataDescriptor._size value. A remote attacker can send a specially crafted TCP message to cause a denial of service.

The issue occurs before protocol-level validation, and no authentication, encryption, or valid JIT compilation request is required. Deployments running without TLS client authentication are affected by default.

Remediation

Install update from vendor's website.

References

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