Eclipse Vert.x — security advisory

{
  "id": "929dfac20ad23e5efe35ffada6ec7622b12646903e8d33c653f22238a77dc26f",
  "url": "https://www.cve.org/CVERecord?id=CVE-2026-102479",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-102479",
    "summary": "In Eclipse Vert.x versions [5.0.0,5.0.12] or [5.1.0,5.1.9] or [5.2.0, 5.2.0], the Vert.x HTTP/1.x decoder uses a canonicalization for well known HTTP headers, the canonicalization process interprets well crafted headers as headers of this list, allowing for instance Content-Xength to be interpeted as Content-Length. This can be exploited for request smuggling purpose. The impacted component is io.vertx:vertx-core.",
    "evidence": "cve:CVE-2026-102479",
    "products": [
      {
        "name": {
          "value": "Eclipse Vert.x",
          "evidence": "/containers/cna/affected/0/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-102479",
      "aliases": [
        "CVE-2026-102479"
      ],
      "metrics": [
        {
          "format": "CVSS",
          "cvssV4_0": {
            "Safety": "NOT_DEFINED",
            "version": "4.0",
            "Recovery": "NOT_DEFINED",
            "baseScore": 8.7,
            "Automatable": "NOT_DEFINED",
            "attackVector": "NETWORK",
            "baseSeverity": "HIGH",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N",
            "exploitMaturity": "NOT_DEFINED",
            "providerUrgency": "NOT_DEFINED",
            "userInteraction": "NONE",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "privilegesRequired": "NONE",
            "subIntegrityImpact": "NONE",
            "vulnIntegrityImpact": "HIGH",
            "subAvailabilityImpact": "NONE",
            "vulnAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "vulnConfidentialityImpact": "NONE",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "affected": [
        {
          "vendor": "Eclipse Foundation",
          "product": "Eclipse Vert.x",
          "versions": [
            {
              "status": "affected",
              "version": "5.0.0",
              "versionType": "semver",
              "lessThanOrEqual": "5.0.12"
            },
            {
              "status": "affected",
              "version": "5.1.0",
              "versionType": "semver",
              "lessThanOrEqual": "5.1.9"
            },
            {
              "status": "affected",
              "version": "5.2.0",
              "versionType": "semver"
            }
          ],
          "defaultStatus": "unaffected"
        }
      ],
      "modified": "2026-10-28T21:06:12.367Z",
      "provider": "cve",
      "references": [
        "https://github.com/eclipse-vertx/vert.x/security/advisories/GHSA-ch7p-g5pm-3gqx",
        "https://gitlab.eclipse.org/security/cve-assignment/-/work_items/352"
      ],
      "provider_metadata": {
        "adp": [
          {
            "title": "CISA ADP Vulnrichment",
            "metrics": [
              {
                "other": {
                  "type": "ssvc",
                  "content": {
                    "id": "CVE-2026-102479",
                    "role": "CISA Coordinator",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "yes"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "version": "2.0.3",
                    "timestamp": "2026-10-16T18:23:27.862590Z"
                  }
                }
              }
            ],
            "problemTypes": [
              {
                "descriptions": [
                  {
                    "lang": "en",
                    "type": "CWE",
                    "cweId": "CWE-444",
                    "description": "CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')"
                  }
                ]
              }
            ],
            "providerMetadata": {
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP",
              "dateUpdated": "2026-10-16T18:23:47.949Z"
            }
          },
          {
            "title": "CVE Program Container",
            "references": [
              {
                "url": "http://www.openwall.com/lists/oss-security/2026/10/28/19"
              }
            ],
            "providerMetadata": {
              "orgId": "af854a3a-2127-422b-91ae-364da2661108",
              "shortName": "CVE",
              "dateUpdated": "2026-10-28T21:06:12.367Z"
            }
          }
        ],
        "cna": {
          "orgId": "e51fbebd-6053-4e49-959f-1b94eeb69a2c",
          "shortName": "eclipse",
          "dateUpdated": "2026-10-14T18:43:54.623Z"
        }
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-102479",
        "evidence": "/cveMetadata/cveId"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/containers/cna/metrics"
  },
  "source_id": "core-cve",
  "document_id": 491711,
  "published_at": "2026-10-14T18:43:54.623+00:00"
}