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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 4.2.15.Final"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "io.netty:netty-codec-http2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.2.0.Final"
            },
            {
              "fixed": "4.2.16.Final"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "io.netty:netty-codec-http2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.1.136.Final"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-59900"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-444"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-22T21:49:28Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "Netty\u0027s HTTP/2-to-HTTP/1.x translation layer (`Http2StreamFrameToHttpObjectCodec` and `InboundHttp2ToHttpAdapter`) fails to deduplicate or validate `Host` headers when an HTTP/2 client supplies both the `:authority` pseudo-header and a literal `host` header in a single HEADERS frame. The translator maps `:authority` to `Host` and separately copies the literal `host` header, producing an `HttpRequest` object containing two `Host` headers with attacker-controlled differing values.",
  "id": "GHSA-c69g-56f8-xwqj",
  "modified": "2026-07-22T21:49:28Z",
  "published": "2026-07-22T21:49:28Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/netty/netty/security/advisories/GHSA-c69g-56f8-xwqj"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/netty/netty"
    },
    {
      "type": "WEB",
      "url": "https://github.com/netty/netty/releases/tag/netty-4.1.136.Final"
    },
    {
      "type": "WEB",
      "url": "https://github.com/netty/netty/releases/tag/netty-4.2.16.Final"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Netty: [codec-http2] Lack of Host Header Deduplication in HTTP/2\u2192HTTP/1.x Translation Leads to Request Routing Bypass"
}

{
  "document": {
    "aggregate_severity": {
      "text": "hoch"
    },
    "category": "csaf_base",
    "csaf_version": "2.0",
    "distribution": {
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "de-DE",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "Das BSI ist als Anbieter f\u00fcr die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch daf\u00fcr verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgf\u00e4ltig im Einzelfall zu pr\u00fcfen."
      },
      {
        "category": "description",
        "text": "Netty ist ein asynchrones, ereignisgesteuertes Netzwerk-Anwendungs-Framework f\u00fcr die schnelle Entwicklung von wartbaren, hochleistungsf\u00e4higen Protokollservern und -clients.",
        "title": "Produktbeschreibung"
      },
      {
        "category": "summary",
        "text": "Ein Angreifer kann mehrere Schwachstellen in Netty ausnutzen, um Sicherheitspr\u00fcfungen zu umgehen, Anfragen oder Header zu manipulieren, Zertifikatspr\u00fcfungen zu unterlaufen sowie einen Denial of Service zu verursachen.",
        "title": "Angriff"
      },
      {
        "category": "general",
        "text": "- Linux\n- UNIX",
        "title": "Betroffene Betriebssysteme"
      }
    ],
    "publisher": {
      "category": "other",
      "contact_details": "csaf-provider@cert-bund.de",
      "name": "Bundesamt f\u00fcr Sicherheit in der Informationstechnik",
      "namespace": "https://www.bsi.bund.de"
    },
    "references": [
      {
        "category": "self",
        "summary": "WID-SEC-W-2026-2356 - CSAF Version",
        "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-2356.json"
      },
      {
        "category": "self",
        "summary": "WID-SEC-2026-2356 - Portal Version",
        "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-2356"
      },
      {
        "category": "external",
        "summary": "GitHub Security Advisory GHSA-4qhr-g3c6-fcfx vom 2026-07-14",
        "url": "https://github.com/netty/netty/security/advisories/GHSA-4qhr-g3c6-fcfx"
      },
      {
        "category": "external",
        "summary": "GitHub Security Advisory GHSA-272m-gcwp-mpwg vom 2026-07-14",
        "url": "https://github.com/netty/netty/security/advisories/GHSA-272m-gcwp-mpwg"
      },
      {
        "category": "external",
        "summary": "GitHub Security Advisory GHSA-3g8r-4pfx-jmfh vom 2026-07-14",
        "url": "https://github.com/netty/netty/security/advisories/GHSA-3g8r-4pfx-jmfh"
      },
      {
        "category": "external",
        "summary": "GitHub Security Advisory GHSA-4mp9-239f-g9hg vom 2026-07-14",
        "url": "https://github.com/netty/netty/security/advisories/GHSA-4mp9-239f-g9hg"
      },
      {
        "category": "external",
        "summary": "GitHub Security Advisory GHSA-q4f6-jm68-57ww vom 2026-07-14",
        "url": "https://github.com/netty/netty/security/advisories/GHSA-q4f6-jm68-57ww"
      },
      {
        "category": "external",
        "summary": "GitHub Security Advisory GHSA-c69g-56f8-xwqj vom 2026-07-14",
        "url": "https://github.com/netty/netty/security/advisories/GHSA-c69g-56f8-xwqj"
      },
      {
        "category": "external",
        "summary": "GitHub Security Advisory GHSA-558v-64gr-wgg4 vom 2026-07-14",
        "url": "https://github.com/netty/netty/security/advisories/GHSA-558v-64gr-wgg4"
      },
      {
        "category": "external",
        "summary": "GitHub Security Advisory GHSA-6jqx-86gh-f27w vom 2026-07-14",
        "url": "https://github.com/netty/netty/security/advisories/GHSA-6jqx-86gh-f27w"
      },
      {
        "category": "external",
        "summary": "GitHub Security Advisory GHSA-93wv-jw9v-4972 vom 2026-07-14",
        "url": "https://github.com/netty/netty/security/advisories/GHSA-93wv-jw9v-4972"
      },
      {
        "category": "external",
        "summary": "GitHub Security Advisory GHSA-g7hg-vrcf-mvmr vom 2026-07-14",
        "url": "https://github.com/netty/netty/security/advisories/GHSA-g7hg-vrcf-mvmr"
      },
      {
        "category": "external",
        "summary": "GitHub Security Advisory GHSA-gcjf-9mgh-3p7g vom 2026-07-14",
        "url": "https://github.com/netty/netty/security/advisories/GHSA-gcjf-9mgh-3p7g"
      },
      {
        "category": "external",
        "summary": "GitHub Security Advisory GHSA-hpcc-26xq-25fv vom 2026-07-14",
        "url": "https://github.com/netty/netty/security/advisories/GHSA-hpcc-26xq-25fv"
      },
      {
        "category": "external",
        "summary": "GitHub Security Advisory GHSA-jppx-w49h-x2qq vom 2026-07-14",
        "url": "https://github.com/netty/netty/security/advisories/GHSA-jppx-w49h-x2qq"
      },
      {
        "category": "external",
        "summary": "GitHub Security Advisory GHSA-mvh2-crg5-v77c vom 2026-07-14",
        "url": "https://github.com/netty/netty/security/advisories/GHSA-mvh2-crg5-v77c"
      },
      {
        "category": "external",
        "summary": "GitHub Security Advisory GHSA-q6cq-mhr2-jmr5 vom 2026-07-14",
        "url": "https://github.com/netty/netty/security/advisories/GHSA-q6cq-mhr2-jmr5"
      },
      {
        "category": "external",
        "summary": "GitHub Security Advisory GHSA-vhch-2wf3-m8rp vom 2026-07-14",
        "url": "https://github.com/netty/netty/security/advisories/GHSA-vhch-2wf3-m8rp"
      },
      {
        "category": "external",
        "summary": "GitHub Security Advisory GHSA-wc96-39fc-566f vom 2026-07-14",
        "url": "https://github.com/netty/netty/security/advisories/GHSA-wc96-39fc-566f"
      }
    ],
    "source_lang": "en-US",
    "title": "Netty: Mehrere Schwachstellen",
    "tracking": {
      "current_release_date": "2026-07-21T22:00:00.000+00:00",
      "generator": {
        "date": "2026-07-22T09:20:42.612+00:00",
        "engine": {
          "name": "BSI-WID",
          "version": "1.6.0"
        }
      },
      "id": "WID-SEC-W-2026-2356",
      "initial_release_date": "2026-07-14T22:00:00.000+00:00",
      "revision_history": [
        {
          "date": "2026-07-14T22:00:00.000+00:00",
          "number": "1",
          "summary": "Initiale Fassung"
        },
        {
          "date": "2026-07-19T22:00:00.000+00:00",
          "number": "2",
          "summary": "Referenz(en) aufgenommen: EUVD-2026-45316"
        },
        {
          "date": "2026-07-20T22:00:00.000+00:00",
          "number": "3",
          "summary": "Referenz(en) aufgenommen: EUVD-2026-46133, EUVD-2026-46132"
        },
        {
          "date": "2026-07-21T22:00:00.000+00:00",
          "number": "4",
          "summary": "Referenz(en) aufgenommen: EUVD-2026-46452, EUVD-2026-46438, EUVD-2026-47564, EUVD-2026-47579, EUVD-2026-47582, EUVD-2026-47581"
        }
      ],
      "status": "final",
      "version": "4"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c4.2.16",
                "product": {
                  "name": "Open Source Netty \u003c4.2.16",
                  "product_id": "T056598"
                }
              },
              {
                "category": "product_version",
                "name": "4.2.16",
                "product": {
                  "name": "Open Source Netty 4.2.16",
                  "product_id": "T056598-fixed",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:netty:netty:4.2.16"
                  }
                }
              },
              {
                "category": "product_version_range",
                "name": "\u003c4.1.136",
                "product": {
                  "name": "Open Source Netty \u003c4.1.136",
                  "product_id": "T056599"
                }
              },
              {
                "category": "product_version",
                "name": "4.1.136",
                "product": {
                  "name": "Open Source Netty 4.1.136",
                  "product_id": "T056599-fixed",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:netty:netty:4.1.136"
                  }
                }
              }
            ],
            "category": "product_name",
            "name": "Netty"
          }
        ],
        "category": "vendor",
        "name": "Open Source"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-44891",
      "product_status": {
        "known_affected": [
          "T056599",
          "T056598"
        ]
      },
      "release_date": "2026-07-14T22:00:00.000+00:00",
      "title": "CVE-2026-44891"
    },
    {
      "cve": "CVE-2026-55831",
      "product_status": {
        "known_affected": [
          "T056599",
          "T056598"
        ]
      },
      "release_date": "2026-07-14T22:00:00.000+00:00",
      "title": "CVE-2026-55831"
    },
    {
      "cve": "CVE-2026-55833",
      "product_status": {
        "known_affected": [
          "T056599",
          "T056598"
        ]
      },
      "release_date": "2026-07-14T22:00:00.000+00:00",
      "title": "CVE-2026-55833"
    },
    {
      "cve": "CVE-2026-55851",
      "product_status": {
        "known_affected": [
          "T056599",
          "T056598"
        ]
      },
      "release_date": "2026-07-14T22:00:00.000+00:00",
      "title": "CVE-2026-55851"
    },
    {
      "cve": "CVE-2026-56745",
      "product_status": {
        "known_affected": [
          "T056599",
          "T056598"
        ]
      },
      "release_date": "2026-07-14T22:00:00.000+00:00",
      "title": "CVE-2026-56745"
    },
    {
      "cve": "CVE-2026-56816",
      "product_status": {
        "known_affected": [
          "T056599",
          "T056598"
        ]
      },
      "release_date": "2026-07-14T22:00:00.000+00:00",
      "title": "CVE-2026-56816"
    },
    {
      "cve": "CVE-2026-56817",
      "product_status": {
        "known_affected": [
          "T056599",
          "T056598"
        ]
      },
      "release_date": "2026-07-14T22:00:00.000+00:00",
      "title": "CVE-2026-56817"
    },
    {
      "cve": "CVE-2026-56819",
      "product_status": {
        "known_affected": [
          "T056599",
          "T056598"
        ]
      },
      "release_date": "2026-07-14T22:00:00.000+00:00",
      "title": "CVE-2026-56819"
    },
    {
      "cve": "CVE-2026-56820",
      "product_status": {
        "known_affected": [
          "T056599",
          "T056598"
        ]
      },
      "release_date": "2026-07-14T22:00:00.000+00:00",
      "title": "CVE-2026-56820"
    },
    {
      "cve": "CVE-2026-56821",
      "product_status": {
        "known_affected": [
          "T056599",
          "T056598"
        ]
      },
      "release_date": "2026-07-14T22:00:00.000+00:00",
      "title": "CVE-2026-56821"
    },
    {
      "cve": "CVE-2026-56822",
      "product_status": {
        "known_affected": [
          "T056599",
          "T056598"
        ]
      },
      "release_date": "2026-07-14T22:00:00.000+00:00",
      "title": "CVE-2026-56822"
    },
    {
      "cve": "CVE-2026-59898",
      "product_status": {
        "known_affected": [
          "T056599",
          "T056598"
        ]
      },
      "release_date": "2026-07-14T22:00:00.000+00:00",
      "title": "CVE-2026-59898"
    },
    {
      "cve": "CVE-2026-59899",
      "product_status": {
        "known_affected": [
          "T056599",
          "T056598"
        ]
      },
      "release_date": "2026-07-14T22:00:00.000+00:00",
      "title": "CVE-2026-59899"
    },
    {
      "cve": "CVE-2026-59900",
      "product_status": {
        "known_affected": [
          "T056599",
          "T056598"
        ]
      },
      "release_date": "2026-07-14T22:00:00.000+00:00",
      "title": "CVE-2026-59900"
    },
    {
      "cve": "CVE-2026-59901",
      "product_status": {
        "known_affected": [
          "T056599",
          "T056598"
        ]
      },
      "release_date": "2026-07-14T22:00:00.000+00:00",
      "title": "CVE-2026-59901"
    },
    {
      "cve": "CVE-2026-59920",
      "product_status": {
        "known_affected": [
          "T056599",
          "T056598"
        ]
      },
      "release_date": "2026-07-14T22:00:00.000+00:00",
      "title": "CVE-2026-59920"
    },
    {
      "cve": "CVE-2026-59921",
      "product_status": {
        "known_affected": [
          "T056599",
          "T056598"
        ]
      },
      "release_date": "2026-07-14T22:00:00.000+00:00",
      "title": "CVE-2026-59921"
    }
  ]
}