CVE-2026-94265 (GCVE-0-2026-94265)
Vulnerability from cvelistv5
Published
2026-10-20 20:26
Modified
2026-10-20 20:26
Severity ?
CWE
Summary
When processing an HTTP redirect to a URL containing userinfo (a `username:password` component), curl might erroneously retain and re-transmit the original host's HTTP Negotiate authentication state. Consequently, a malicious server can trigger a redirect containing arbitrary userinfo to force curl to send a freshly minted Kerberos ticket—generated using the ambient identity of the client process to an untrusted third-party host, effectively bypassing the domain-scoping restrictions normally enforced by the absence of `--location-trusted`.
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": "Joshua Rogers (Aisle Research)"
        },
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "Joshua Rogers (Aisle Research)"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "When processing an HTTP redirect to a URL containing userinfo (a\n`username:password` component), curl might erroneously retain and re-transmit\nthe original host\u0027s HTTP Negotiate authentication state. Consequently, a\nmalicious server can trigger a redirect containing arbitrary userinfo to force\ncurl to send a freshly minted Kerberos ticket\u2014generated using the ambient\nidentity of the client process to an untrusted third-party host, effectively\nbypassing the domain-scoping restrictions normally enforced by the absence of\n`--location-trusted`."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "CWE-200 Exposure of Sensitive Information to an Unauthorized Actor",
              "lang": "en"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-20T20:26:18.061Z",
        "orgId": "2499f714-1537-4658-8207-48ae4bb9eae9",
        "shortName": "curl"
      },
      "references": [
        {
          "name": "json",
          "url": "https://curl.se/docs/CVE-2026-94265.json"
        },
        {
          "name": "www",
          "url": "https://curl.se/docs/CVE-2026-94265.html"
        },
        {
          "name": "issue",
          "url": "https://hackerone.com/reports/4040551"
        }
      ],
      "title": "Authorization: Negotiate sent to foreign origin"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "2499f714-1537-4658-8207-48ae4bb9eae9",
    "assignerShortName": "curl",
    "cveId": "CVE-2026-94265",
    "datePublished": "2026-10-20T20:26:18.061Z",
    "dateReserved": "2026-09-21T09:07:44.636Z",
    "dateUpdated": "2026-10-20T20:26:18.061Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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