{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": [
              "cpe:2.3:a:elastic:elasticsearch:*:*:*:*:*:*:*:*",
              "cpe:2.3:a:elastic:elasticsearch:9.5.0:*:*:*:*:*:*:*"
            ],
            "extracted_events": [
              {
                "introduced": "8.18.0"
              },
              {
                "fixed": "8.19.20"
              },
              {
                "introduced": "9.0.0"
              },
              {
                "fixed": "9.4.5"
              },
              {
                "introduced": "9.5.0"
              },
              {
                "last_affected": "9.5.0"
              }
            ],
            "source": [
              "CPE_RANGE",
              "CPE_STRING"
            ]
          },
          "events": [
            {
              "introduced": "04e979aa50b657bebd4a0937389308de82c2bdad"
            },
            {
              "fixed": "91f5381ece296ddc32b554f997269478b9224af8"
            },
            {
              "introduced": "112859b85d50de2a7e63f73c8fc70b99eea24291"
            },
            {
              "fixed": "adc1f04ffdd393d1977990338d5512c5eaf1ce94"
            },
            {
              "introduced": "8d4246a64bc255212407b1b313fe402391299c88"
            },
            {
              "last_affected": "8d4246a64bc255212407b1b313fe402391299c88"
            }
          ],
          "repo": "https://github.com/elastic/elasticsearch",
          "type": "GIT"
        }
      ],
      "versions": [
        "9.5.0"
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "elastic",
    "cwe_ids": [
      "CWE-444"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/78xxx/CVE-2026-78605.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "introduced": "8.18.0"
          },
          {
            "last_affected": "8.19.19"
          },
          {
            "introduced": "9.0.0"
          },
          {
            "last_affected": "9.4.4"
          },
          {
            "introduced": "9.5.0"
          },
          {
            "last_affected": "9.5.0"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling') (CWE-444) in Elasticsearch can lead to information disclosure via HTTP Request Smuggling (CAPEC-33). Under specific proxy deployment configurations, a network attacker could obtain confidential responses intended for other authenticated users.",
  "id": "CVE-2026-78605",
  "modified": "2026-09-04T03:30:22.003494607Z",
  "published": "2026-09-01T19:20:29.342Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://discuss.elastic.co/t/elasticsearch-8-19-20-9-4-5-9-5-1-security-update-esa-2026-141/390092"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/78xxx/CVE-2026-78605.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-78605"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling') in Elasticsearch Leading to Information Disclosure"
}