{
  "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-2026-91769",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-91769",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-09-25T20:59:39.727Z",
    "updatedAt": "2026-10-04T16:10:05.639Z",
    "importedAt": "2026-10-24T01:58:35.090Z",
    "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": "TLS Hostname Verification Falls Back to CN After SAN Mismatch",
      "summary": "PHP's OpenSSL stream peer verification checks the certificate's subjectAltName entries first and, whenever no entry matches, falls back to the Common Name. RFC 6125 requires the CN to be ignored once the certificate presents any service identity, so a certificate carrying a non-matching DNS SAN was still accepted when its CN matched the requested peer_name. A certificate trusted by the client for one name can therefore be used to impersonate another.",
      "affected": [
        {
          "vendor": "PHP Group",
          "product": "PHP",
          "packageName": "ext-openssl",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "8.2.*",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "8.2.34"
            },
            {
              "version": "8.3.*",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "8.3.35"
            },
            {
              "version": "8.4.*",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "8.4.26"
            },
            {
              "version": "8.5.*",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "8.5.11"
            }
          ]
        }
      ]
    }
  }
}