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    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-91768",
        "assignerOrgId": "dd77f84a-d19a-4638-8c3d-a322d820ed2b",
        "state": "PUBLISHED",
        "assignerShortName": "php",
        "dateReserved": "2026-09-15T00:42:30.045Z",
        "datePublished": "2026-09-25T21:07:30.950Z",
        "dateUpdated": "2026-09-28T13:31:31.382Z"
    },
    "containers": {
        "cna": {
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                "orgId": "dd77f84a-d19a-4638-8c3d-a322d820ed2b",
                "shortName": "php",
                "dateUpdated": "2026-09-25T21:07:30.950Z"
            },
            "title": "IPv6 ACL bypass in FastCGI listen.allowed_clients due to partial address comparison (memcmp 12 bytes)",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "lang": "en",
                            "cweId": "CWE-1023",
                            "description": "CWE-1023",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "impacts": [
                {
                    "capecId": "CAPEC-1",
                    "descriptions": [
                        {
                            "lang": "en",
                            "value": "CAPEC-1 Accessing Functionality Not Properly Constrained by ACLs"
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "vendor": "PHP Group",
                    "product": "PHP",
                    "packageName": "PHP-FPM",
                    "versions": [
                        {
                            "status": "affected",
                            "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"
                        }
                    ],
                    "defaultStatus": "unaffected"
                }
            ],
            "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.",
                    "supportingMedia": [
                        {
                            "type": "text/html",
                            "base64": false,
                            "value": "<p>The IPv6 branch of the FastCGI client access check compares only the first 12 bytes of a 16-byte IPv6 address, so <code>listen.allowed_clients</code> 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.</p>"
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://github.com/php/php-src/security/advisories/GHSA-62xp-839h-2637",
                    "tags": [
                        "vendor-advisory"
                    ]
                }
            ],
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                    "scenarios": [
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                            "lang": "en",
                            "value": "GENERAL"
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                    ],
                    "cvssV3_1": {
                        "version": "3.1",
                        "attackVector": "ADJACENT_NETWORK",
                        "attackComplexity": "LOW",
                        "privilegesRequired": "NONE",
                        "userInteraction": "NONE",
                        "scope": "UNCHANGED",
                        "confidentialityImpact": "HIGH",
                        "integrityImpact": "NONE",
                        "availabilityImpact": "NONE",
                        "baseSeverity": "MEDIUM",
                        "baseScore": 6.5,
                        "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
                    }
                }
            ],
            "credits": [
                {
                    "lang": "en",
                    "value": "@l8BL (GitHub)",
                    "type": "reporter"
                },
                {
                    "lang": "en",
                    "value": "@OSTIF-Derek (GitHub)",
                    "type": "reporter"
                },
                {
                    "lang": "en",
                    "value": "Ilia Alshanetsky",
                    "type": "reporter"
                },
                {
                    "lang": "en",
                    "value": "Alexandre Daubois",
                    "type": "remediation developer"
                },
                {
                    "lang": "en",
                    "value": "Arnaud Le Blanc",
                    "type": "remediation reviewer"
                },
                {
                    "lang": "en",
                    "value": "Jakub Zelenka",
                    "type": "remediation reviewer"
                }
            ],
            "source": {
                "discovery": "UNKNOWN"
            },
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                "engine": "Vulnogram 1.0.5"
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        },
        "adp": [
            {
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "id": "CVE-2026-91768",
                                "role": "CISA Coordinator",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
                                    {
                                        "Automatable": "no"
                                    },
                                    {
                                        "Technical Impact": "partial"
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                                ],
                                "version": "2.0.3",
                                "timestamp": "2026-09-28T12:57:04.931780Z"
                            }
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                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-09-28T13:31:31.382Z"
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}