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follow-redirects: Custom Authentication Headers Leaked to Cross-Domain Redirect Targets

Type: advisorySources: OSV

follow-redirects is an open source, drop-in replacement for Node's `http` and `https` modules that automatically follows redirects. Prior to 1.16.0, when an HTTP request follows a cross-domain redirect (301/302/307/308), follow-redirects only strips authorization, proxy-authorization, and cookie headers (matched by regex at index.js). Any custom authentication header (e.g., X-API-Key, X-Auth-Token, Api-Key, Token) is forwarded verbatim to the redirect target. This vulnerability is fixed in 1.16.0.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-40895
Confirmed fixed CVEs
Not specified
Updated in this feed
3 Nov 2026, 18:53 UTC · Revision 1

Source evidence

follow-redirects: Custom Authentication Headers Leaked to Cross-Domain Redirect Targets

core-osv · Original source

Published 21 Apr 2026, 19:59 UTC

follow-redirects is an open source, drop-in replacement for Node's `http` and `https` modules that automatically follows redirects. Prior to 1.16.0, when an HTTP request follows a cross-domain redirect (301/302/307/308), follow-redirects only strips authorization, proxy-authorization, and cookie headers (matched by regex at index.js). Any custom authentication header (e.g., X-API-Key, X-Auth-Token, Api-Key, Token) is forwarded verbatim to the redirect target. This vulnerability is fixed in 1.16.0.

osv:CVE-2026-40895
Complete source record
{
  "id": "72fca99738be9056a123c33e800e4466228edac6af597c4f0b19d829e7cb8dc0",
  "url": "https://osv.dev/vulnerability/CVE-2026-40895",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "follow-redirects: Custom Authentication Headers Leaked to Cross-Domain Redirect Targets",
    "summary": "follow-redirects is an open source, drop-in replacement for Node's `http` and `https` modules that automatically follows redirects. Prior to 1.16.0, when an HTTP request follows a cross-domain redirect (301/302/307/308), follow-redirects only strips authorization, proxy-authorization, and cookie headers (matched by regex at index.js). Any custom authentication header (e.g., X-API-Key, X-Auth-Token, Api-Key, Token) is forwarded verbatim to the redirect target. This vulnerability is fixed in 1.16.0.",
    "evidence": "osv:CVE-2026-40895",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-40895",
      "aliases": [
        "CVE-2026-40895",
        "GHSA-r4q5-vmmm-2653"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/follow-redirects/follow-redirects",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "0c23a223067201c368035e82954c11eb2578a33b"
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              "database_specific": {
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                        "introduced": "0"
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                        "fixed": "1.16.0"
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                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "cpe": "cpe:2.3:a:follow-redirects_project:follow-redirects:*:*:*:*:*:node.js:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.16.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
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            "v1.9.1",
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            "v1.2.6",
            "v1.2.5",
            "v1.2.4",
            "v1.2.3",
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            "v1.2.1",
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            "v1.0.0",
            "v0.3.0",
            "v0.2.0",
            "v0.1.0",
            "v0.0.6"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-40895.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:31.463546069Z",
      "provider": "osv",
      "references": [
        "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-40895.json",
        "https://access.redhat.com/errata/RHSA-2026:13826",
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        "https://access.redhat.com/errata/RHSA-2026:16874",
        "https://access.redhat.com/errata/RHSA-2026:17657",
        "https://access.redhat.com/errata/RHSA-2026:17699",
        "https://access.redhat.com/errata/RHSA-2026:17789",
        "https://access.redhat.com/errata/RHSA-2026:19109",
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        "https://access.redhat.com/errata/RHSA-2026:27004",
        "https://access.redhat.com/errata/RHSA-2026:27044",
        "https://access.redhat.com/errata/RHSA-2026:27063",
        "https://access.redhat.com/errata/RHSA-2026:36882",
        "https://access.redhat.com/errata/RHSA-2026:40768",
        "https://access.redhat.com/errata/RHSA-2026:41928",
        "https://access.redhat.com/errata/RHSA-2026:44235",
        "https://access.redhat.com/errata/RHSA-2026:44263",
        "https://access.redhat.com/errata/RHSA-2026:44267",
        "https://access.redhat.com/errata/RHSA-2026:47728",
        "https://access.redhat.com/errata/RHSA-2026:48699",
        "https://access.redhat.com/errata/RHSA-2026:50300",
        "https://access.redhat.com/errata/RHSA-2026:65126",
        "https://access.redhat.com/security/cve/CVE-2026-40895",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40895.json",
        "https://github.com/follow-redirects/follow-redirects/security/advisories/GHSA-r4q5-vmmm-2653",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-40895",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2460297"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-200"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40895.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-40895",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 498571,
  "published_at": "2026-04-21T19:59:59.759+00:00"
}