CVE-2026-91768

{"dataType": "CVE_RECORD", "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": {"providerMetadata": {"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"]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "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"}, "x_generator": {"engine": "Vulnogram 1.0.5"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-91768", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-09-28T12:57:04.931780Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-28T13:31:31.382Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-91768", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-09-28T12:57:04.931780Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-28T13:24:42.006Z"}}], "cna": {"title": "IPv6 ACL bypass in FastCGI listen.allowed_clients due to partial address comparison (memcmp 12 bytes)", "source": {"discovery": "UNKNOWN"}, "credits": [{"lang": "en", "type": "reporter", "value": "@l8BL (GitHub)"}, {"lang": "en", "type": "reporter", "value": "@OSTIF-Derek (GitHub)"}, {"lang": "en", "type": "reporter", "value": "Ilia Alshanetsky"}, {"lang": "en", "type": "remediation developer", "value": "Alexandre Daubois"}, {"lang": "en", "type": "remediation reviewer", "value": "Arnaud Le Blanc"}, {"lang": "en", "type": "remediation reviewer", "value": "Jakub Zelenka"}], "impacts": [{"capecId": "CAPEC-1", "descriptions": [{"lang": "en", "value": "CAPEC-1 Accessing Functionality Not Properly Constrained by ACLs"}]}], "metrics": [{"format": "CVSS", "cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 6.5, "attackVector": "ADJACENT_NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "affected": [{"vendor": "PHP Group", "product": "PHP", "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"}], "packageName": "PHP-FPM", "defaultStatus": "unaffected"}], "references": [{"url": "https://github.com/php/php-src/security/advisories/GHSA-62xp-839h-2637", "tags": ["vendor-advisory"]}], "x_generator": {"engine": "Vulnogram 1.0.5"}, "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", "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>", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-1023", "description": "CWE-1023"}]}], "providerMetadata": {"orgId": "dd77f84a-d19a-4638-8c3d-a322d820ed2b", "shortName": "php", "dateUpdated": "2026-09-25T21:07:30.950Z"}}}, "cveMetadata": {"cveId": "CVE-2026-91768", "state": "PUBLISHED", "dateUpdated": "2026-09-28T13:31:31.382Z", "dateReserved": "2026-09-15T00:42:30.045Z", "assignerOrgId": "dd77f84a-d19a-4638-8c3d-a322d820ed2b", "datePublished": "2026-09-25T21:07:30.950Z", "assignerShortName": "php"}, "dataVersion": "5.2"}

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

{"bugzilla": {"description": "php: php: Access control bypass via partial IPv6 address comparison", "id": "2541660", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2541660"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.5", "cvss3_scoring_vector": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "status": "draft"}, "cwe": "CWE-940", "details": ["A flaw was found in PHP. The access control check for Internet Protocol version 6 (IPv6) addresses in the FastCGI implementation compares only the first 12 bytes of a 16-byte address instead of the complete address. An attacker on an adjacent network with an address sharing the first 96 bits with an authorized client can bypass network access restrictions to reach the FastCGI endpoint, potentially leading to unauthorized information disclosure."], "name": "CVE-2026-91768", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "php", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "php8.4", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "php", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "php", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "php:7.4/php", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "php:8.2/php", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "php", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "php:8.2/php", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "php:8.3/php", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "php:8.4/php", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "package_name": "php", "product_name": "Red Hat Hardened Images"}], "public_date": "2026-09-25T21:07:30Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-91768\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-91768\nhttps://github.com/php/php-src/security/advisories/GHSA-62xp-839h-2637"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[8.2.0,8.2.34)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[8.3.0,8.3.35)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[8.4.0,8.4.26)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[8.5.0,8.5.11)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "PHP", "source": "cna", "vendor": "PHP Group"}, "product": "php", "vendor": "php_group"}], "created": "2026-09-25T23:30:17.966221+00:00", "updated": "2026-09-26T08:00:10.483681+00:00", "vendors": ["php_group", "php_group$PRODUCT$php"]}