CVE-2026-91768

{
  "id": "CVE-2026-91768",
  "sourceIdentifier": "[email protected]",
  "published": "2026-09-25T22:18:49.807",
  "lastModified": "2026-10-27T15:40:27.307",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "The IPv6 branch of the FastCGI client access check compares only the first 12 bytes of a 16-byte IPv6 address, so listen.allowed_clients matches on a /96 prefix instead of the exact address. An attacker who can source an address sharing the first 96 bits with an allowed one passes the check and reaches the FastCGI endpoint."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "PHP Group",
          "product": "PHP",
          "defaultStatus": "unaffected",
          "packageName": "PHP-FPM",
          "versions": [
            {
              "version": "8.2.*",
              "lessThan": "8.2.34",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "8.3.*",
              "lessThan": "8.3.35",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "8.4.*",
              "lessThan": "8.4.26",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "8.5.*",
              "lessThan": "8.5.11",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "attackVector": "ADJACENT_NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "availabilityImpact": "NONE"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 3.6
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-09-28T12:57:04.931780Z",
          "id": "CVE-2026-91768",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-1023"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:php:php:*:*:*:*:*:*:*:*",
              "versionStartIncluding": "8.2.0",
              "versionEndExcluding": "8.2.34",
              "matchCriteriaId": "AAFB3643-4D71-46ED-8184-DDE5FE41CD02"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:php:php:*:*:*:*:*:*:*:*",
              "versionStartIncluding": "8.3.0",
              "versionEndExcluding": "8.3.35",
              "matchCriteriaId": "FF664EE8-D417-45A4-84DF-158F5073FDE8"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:php:php:*:*:*:*:*:*:*:*",
              "versionStartIncluding": "8.4.0",
              "versionEndExcluding": "8.4.26",
              "matchCriteriaId": "52D4BECA-EF0D-4180-837C-AEFA7A12D243"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:php:php:*:*:*:*:*:*:*:*",
              "versionStartIncluding": "8.5.0",
              "versionEndExcluding": "8.5.11",
              "matchCriteriaId": "308803C0-9FC8-40D2-8920-B83BCC48014F"
            }
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      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/php/php-src/security/advisories/GHSA-62xp-839h-2637",
      "source": "[email protected]",
      "tags": [
        "Vendor Advisory"
      ]
    }
  ]
}