{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2026-105298",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-105298",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-10-20T00:46:21.902Z",
    "updatedAt": "2026-10-20T19:20:10.015Z",
    "importedAt": "2026-10-24T01:57:50.502Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "Pingora HTTP/2 :authority and Host header mismatch enables cache poisoning and host-based access control bypass",
      "summary": "Summary\n\n\n\nBefore version 0.9.0, Pingora accepted HTTP/2 requests whose Host header differed from the :authority pseudo-header. Request filters, cache keys, and logs that read the request URI (session.req_header().uri) saw the :authority value, but the upstream received the client-supplied Host value. Pingora also accepted :authority values containing userinfo (for example, user@example.com). This violates RFC 9113 Section 8.3.1, which requires an intermediary to use the :authority value for Host and replace any existing Host field.\n\n\n\n\nRoot cause\n\n  *  \n\nHTTP/2 to HTTP/1.1: Host was generated from :authority only when the request had no Host header, so a conflicting client Host was forwarded unchanged.\n\n\n  *  \n\nHTTP/2 to HTTP/2: the client Host header was removed and used to overwrite the upstream :authority, after request filters had already run against the original :authority.\n\n\n  *  \n\nThe HTTP/2 server did not compare Host with :authority and did not reject userinfo in the authority.\n\n\n\n\n\n\n\nImpact\n\n\n\nA remote, unauthenticated attacker can send a single HTTP/2 request that the application sees as one host and the upstream receives as another. Where request filters, access controls, or cache keys use the URI authority and the upstream routes by Host, this can lead to:\n\n  *  \n\nCache poisoning: a response from another virtual host is stored under the victim host's cache key and served to other users (this also requires the upstream to serve different content per Host).\n\n\n  *  \n\nHost-based access control bypass: a request approved for one host is served by a different virtual host on the upstream.\n\n\n\n\n\n\nDeployments that do not accept HTTP/2 from clients, or that do not use the request authority for security or caching decisions, are not affected.\n\n\n\n\nNote that Cloudflare CDN customers were unaffected, as internal Pingora services at Cloudflare do not have HTTP/2 clients.\n\n\n\n\nMitigation:\n\n  *  \n\nUpgrade to pingora 0.9.0 or later. Pingora now returns 400 Bad Request for HTTP/2 requests whose Host differs from :authority, that contain more than one Host, or whose authority contains userinfo, and keeps the upstream Host or :authority consistent with the request authority. Fix commits:  https://github.com/cloudflare/pingora/commit/915590a91811877795531f6ba0927a3138b5cb4b ,  https://github.com/cloudflare/pingora/commit/ffab8302d08d4292d1924eb8fe84647fd5cb8e76 \n\n\n  *  \n\nIf you cannot upgrade: in request_filter, reject HTTP/2 requests that carry a Host header different from the URI authority, or whose authority contains '@'.",
      "affected": [
        {
          "vendor": "Cloudflare",
          "product": "https://github.com/cloudflare/pingora",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "0.1.0",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "0.9.0"
            }
          ]
        }
      ]
    }
  }
}