CVE-2026-94265 (GCVE-0-2026-94265)

Vulnerability from cvelistv5 – Published: 2026-10-20 20:26 – Updated: 2026-10-20 20:26
VLAI
Title
Authorization: Negotiate sent to foreign origin
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`.
Severity
No CVSS data available.
Assigner
curl CNA under the redhat root
CNA scorecard D 46/100 over 59 records in the last 180 days details
Impacted products
Vendor Product Version CPE status
curl curl Affected: 8.22.0 , ≤ 8.22.0 (semver)
Affected: 8.21.0 , ≤ 8.21.0 (semver)
guessed Create a notification for this product.
Show details on NVD website

{
  "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",
  "vulnerability-lookup:meta": {
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "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"
                  }
                ]
              }
            ],
            "source": "2499f714-1537-4658-8207-48ae4bb9eae9"
          }
        ],
        "cveTags": [],
        "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`."
          }
        ],
        "id": "CVE-2026-94265",
        "lastModified": "2026-10-20T21:17:22.183",
        "metrics": {},
        "published": "2026-10-20T21:17:22.183",
        "references": [
          {
            "source": "2499f714-1537-4658-8207-48ae4bb9eae9",
            "url": "https://curl.se/docs/CVE-2026-94265.html"
          },
          {
            "source": "2499f714-1537-4658-8207-48ae4bb9eae9",
            "url": "https://curl.se/docs/CVE-2026-94265.json"
          },
          {
            "source": "2499f714-1537-4658-8207-48ae4bb9eae9",
            "url": "https://hackerone.com/reports/4040551"
          }
        ],
        "sourceIdentifier": "2499f714-1537-4658-8207-48ae4bb9eae9",
        "vulnStatus": "Received"
      }
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.


Loading…

Loading…

Loading…

Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
Events included in the timeline

Loading timeline…


    Loading…

    Loading…

    Loading…

    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.