Security advisory

{
  "id": "08ffac563f23de38d88ab8c0f73e924f330c43f39e1949c547b1216fa0b2dfa8",
  "url": "https://osv.dev/vulnerability/CVE-2026-6918",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-6918",
    "summary": "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.",
    "evidence": "osv:CVE-2026-6918",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-6918",
      "aliases": [
        "CVE-2026-6918",
        "GHSA-q393-vr4c-969r"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "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"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/eclipse-openj9/openj9",
              "type": "GIT",
              "events": [
                {
                  "introduced": "34cf4c07578b37050e6498dc74c84a83efe321b3"
                },
                {
                  "fixed": "c53b6b93f422b77b3395a3464d5578b706e9a618"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0.21"
                      },
                      {
                        "fixed": "0.59"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "cpe": "cpe:2.3:a:eclipse:openj9:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0.21.0"
                      },
                      {
                        "fixed": "0.59.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-6918.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:52.352099229Z",
      "provider": "osv",
      "references": [
        "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-6918.json",
        "https://access.redhat.com/errata/RHSA-2026:22328",
        "https://access.redhat.com/security/cve/CVE-2026-6918",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/6xxx/CVE-2026-6918.json",
        "https://github.com/eclipse-openj9/openj9/security/advisories/GHSA-q393-vr4c-969r",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-6918",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2466741",
        "https://github.com/eclipse-openj9/openj9/pull/23793"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-125"
        ],
        "cna_assigner": "eclipse",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/6xxx/CVE-2026-6918.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-6918",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 521290,
  "published_at": "2026-05-05T12:29:09.667+00:00"
}