{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-8711",
        "assignerOrgId": "9dacffd4-cb11-413f-8451-fbbfd4ddc0ab",
        "state": "PUBLISHED",
        "assignerShortName": "f5",
        "dateReserved": "2026-05-15T20:10:29.764Z",
        "datePublished": "2026-05-19T14:04:18.860Z",
        "dateUpdated": "2026-05-21T18:29:16.674Z"
    },
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                "orgId": "9dacffd4-cb11-413f-8451-fbbfd4ddc0ab",
                "shortName": "f5",
                "dateUpdated": "2026-05-21T18:29:16.674Z"
            },
            "title": "NGINX JavaScript vulnerability",
            "datePublic": "2026-05-19T14:00:00.000Z",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "lang": "en",
                            "cweId": "CWE-122",
                            "description": "CWE-122 Heap-based Buffer Overflow",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "vendor": "F5",
                    "product": "NGINX JavaScript",
                    "modules": [
                        "ngx_http_js_module"
                    ],
                    "versions": [
                        {
                            "status": "affected",
                            "version": "0.9.4",
                            "lessThan": "0.9.9",
                            "versionType": "custom"
                        }
                    ],
                    "defaultStatus": "unknown"
                }
            ],
            "descriptions": [
                {
                    "lang": "en",
                    "value": "NGINX JavaScript has a vulnerability when the js_fetch_proxy directive is configured with at least one client-controlled NGINX variable (for example, $http_*, $arg_*, $cookie_*) and a location invoking the ngx.fetch() operation from NGINX JavaScript. An unauthenticated attacker can exploit this vulnerability by sending crafted HTTP requests. This may cause a heap buffer overflow in the NGINX worker process leading to a restart. Additionally, attackers can execute code on systems with Address Space Layout Randomization (ASLR) disabled or when the attacker can bypass ASLR. \n\n\nNote: Software versions which have reached End of Technical Support (EoTS) are not evaluated.",
                    "supportingMedia": [
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                            "type": "text/html",
                            "base64": false,
                            "value": "<span style=\"background-color: rgb(255, 255, 255);\">NGINX JavaScript has a vulnerability when the </span><strong>js_fetch_proxy</strong><span style=\"background-color: rgb(255, 255, 255);\">&nbsp;directive is configured with at least one client-controlled NGINX variable (for example, </span><strong>$http_*</strong><span style=\"background-color: rgb(255, 255, 255);\">, </span><strong>$arg_*</strong><span style=\"background-color: rgb(255, 255, 255);\">, </span><strong>$cookie_*</strong><span style=\"background-color: rgb(255, 255, 255);\">) and a location invoking the ngx.fetch() operation from NGINX JavaScript. An unauthenticated attacker can exploit this vulnerability by sending crafted HTTP requests. This may cause a heap buffer overflow in the NGINX worker process leading to a restart. Additionally, attackers can execute code on systems with Address Space Layout Randomization (ASLR) disabled or when the attacker can bypass ASLR.</span> \n\n\nNote: Software versions which have reached End of Technical Support (EoTS) are not evaluated."
                        }
                    ]
                }
            ],
            "tags": [
                "x_F5"
            ],
            "references": [
                {
                    "url": "https://my.f5.com/manage/s/article/K000161307",
                    "tags": [
                        "vendor-advisory"
                    ]
                }
            ],
            "metrics": [
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                            "lang": "en",
                            "value": "GENERAL"
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                    ],
                    "cvssV3_1": {
                        "version": "3.1",
                        "attackVector": "NETWORK",
                        "attackComplexity": "HIGH",
                        "privilegesRequired": "NONE",
                        "userInteraction": "NONE",
                        "scope": "UNCHANGED",
                        "confidentialityImpact": "HIGH",
                        "integrityImpact": "HIGH",
                        "availabilityImpact": "HIGH",
                        "baseSeverity": "HIGH",
                        "baseScore": 8.1,
                        "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"
                    }
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                        "attackRequirements": "PRESENT",
                        "privilegesRequired": "NONE",
                        "userInteraction": "NONE",
                        "vulnConfidentialityImpact": "HIGH",
                        "subConfidentialityImpact": "NONE",
                        "vulnIntegrityImpact": "HIGH",
                        "subIntegrityImpact": "NONE",
                        "vulnAvailabilityImpact": "HIGH",
                        "subAvailabilityImpact": "NONE",
                        "Safety": "NOT_DEFINED",
                        "Automatable": "NOT_DEFINED",
                        "Recovery": "NOT_DEFINED",
                        "valueDensity": "NOT_DEFINED",
                        "vulnerabilityResponseEffort": "NOT_DEFINED",
                        "providerUrgency": "NOT_DEFINED",
                        "baseSeverity": "CRITICAL",
                        "baseScore": 9.2,
                        "vectorString": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
                    }
                }
            ],
            "credits": [
                {
                    "lang": "en",
                    "value": "\"F5 acknowledges udolemi (S2W) for bringing this issue to our attention and following the highest standards of coordinated disclosure.\"",
                    "type": "reporter"
                }
            ],
            "source": {
                "discovery": "EXTERNAL"
            },
            "x_generator": {
                "engine": "F5 SIRTBot v1.0"
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        },
        "adp": [
            {
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-05-19T00:00:00+00:00",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
                                    {
                                        "Automatable": "no"
                                    },
                                    {
                                        "Technical Impact": "total"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3",
                                "id": "CVE-2026-8711"
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                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-05-20T03:55:39.626Z"
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}