CVE-2026-86413 (GCVE-0-2026-86413)
Vulnerability from cvelistv5
Published
2026-10-20 20:06
Modified
2026-10-20 20:06
Severity ?
CWE
Summary
When using an *ambient user* in a first transfer doing Negotiate authentication and asked to follow redirects, curl could pass on its credential details to an unrelated second origin when asked to redirect there.
References
Impacted products
Vendor Product Version
curl curl Version: 8.22.0   ≤ 8.22.0
Version: 8.21.0   ≤ 8.21.0
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "curl",
          "vendor": "curl",
          "versions": [
            {
              "lessThanOrEqual": "8.22.0",
              "status": "affected",
              "version": "8.22.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "8.21.0",
              "status": "affected",
              "version": "8.21.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Stanislav Fort (Aisle Research)"
        },
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "Stefan Eissing"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "When using an *ambient user* in a first transfer doing Negotiate\nauthentication and asked to follow redirects, curl could pass on its\ncredential details to an unrelated second origin when asked to redirect there."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "CWE-201 Information Exposure Through Sent Data",
              "lang": "en"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-20T20:06:11.699Z",
        "orgId": "2499f714-1537-4658-8207-48ae4bb9eae9",
        "shortName": "curl"
      },
      "references": [
        {
          "name": "json",
          "url": "https://curl.se/docs/CVE-2026-86413.json"
        },
        {
          "name": "www",
          "url": "https://curl.se/docs/CVE-2026-86413.html"
        },
        {
          "name": "issue",
          "url": "https://hackerone.com/reports/3993549"
        }
      ],
      "title": "Negotiate credentials sent to redirected origin"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "2499f714-1537-4658-8207-48ae4bb9eae9",
    "assignerShortName": "curl",
    "cveId": "CVE-2026-86413",
    "datePublished": "2026-10-20T20:06:11.699Z",
    "dateReserved": "2026-09-07T12:11:52.093Z",
    "dateUpdated": "2026-10-20T20:06:11.699Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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