{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-111756",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-10-16T17:52:09.081Z",
        "datePublished": "2026-10-20T17:58:21.005Z",
        "dateUpdated": "2026-10-20T17:58:21.005Z"
    },
    "containers": {
        "cna": {
            "title": "follow-redirects array-form headers bypass cross-origin credential stripping",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-200",
                            "lang": "en",
                            "description": "CWE-200: Exposure of Sensitive Information to an Unauthorized Actor",
                            "type": "CWE"
                        }
                    ]
                },
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-212",
                            "lang": "en",
                            "description": "CWE-212: Improper Removal of Sensitive Information Before Storage or Transfer",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV4_0": {
                        "attackVector": "NETWORK",
                        "attackComplexity": "LOW",
                        "attackRequirements": "PRESENT",
                        "privilegesRequired": "NONE",
                        "userInteraction": "NONE",
                        "vulnConfidentialityImpact": "HIGH",
                        "vulnIntegrityImpact": "NONE",
                        "vulnAvailabilityImpact": "NONE",
                        "subConfidentialityImpact": "NONE",
                        "subIntegrityImpact": "NONE",
                        "subAvailabilityImpact": "NONE",
                        "baseScore": 8.2,
                        "baseSeverity": "HIGH",
                        "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
                        "version": "4.0"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/follow-redirects/follow-redirects/security/advisories/GHSA-q3jh-wrc6-jgq8",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/follow-redirects/follow-redirects/security/advisories/GHSA-q3jh-wrc6-jgq8"
                },
                {
                    "name": "https://github.com/follow-redirects/follow-redirects/commit/9865ca45490e4d0f7b6944870318408344570aff",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/follow-redirects/follow-redirects/commit/9865ca45490e4d0f7b6944870318408344570aff"
                },
                {
                    "name": "https://github.com/follow-redirects/follow-redirects/releases/tag/v1.16.1",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/follow-redirects/follow-redirects/releases/tag/v1.16.1"
                }
            ],
            "affected": [
                {
                    "vendor": "follow-redirects",
                    "product": "follow-redirects",
                    "versions": [
                        {
                            "version": ">= 1.16.0, < 1.16.1",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-10-20T17:58:21.005Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "follow-redirects is a Node.js HTTP and HTTPS client wrapper that automatically follows redirects. From version 1.16.0 to before version 1.16.1, follow-redirects removes sensitive credential headers (Authorization, Proxy-Authorization, Cookie, and any caller-declared sensitiveHeaders) before following a redirect that crosses to a different host or downgrades to a less secure protocol. The removal routine iterates the caller's headers container with for...in and matches header names against a filter. This assumes the headers container is a plain object keyed by header names. Node's underlying http.request, which follow-redirects is a drop-in replacement for, also accepts headers as an alternating array of names and values. For an array, for...in yields the numeric indices \"0\", \"1\", \"2\" and so on, which never match a header-name filter, so nothing is removed. An application that sends array-form headers and follows an attacker-controlled cross-origin redirect therefore forwards its Authorization, Cookie, and Proxy-Authorization headers verbatim to the attacker-controlled destination, with no error or warning. The sensitiveHeaders option added to fix CVE-2026-40895 / GHSA-r4q5-vmmm-2653 is equally ineffective, because it relies on the same helper. This is an unauthenticated confidentiality vulnerability: any remote server the victim application contacts can harvest the victim's credential headers by responding with a cross-origin redirect. This issue has been patched in version 1.16.1."
                }
            ],
            "source": {
                "advisory": "GHSA-q3jh-wrc6-jgq8",
                "discovery": "UNKNOWN"
            }
        }
    }
}