CVE-2023-43804 (GCVE-0-2023-43804)

Vulnerability from cvelistv5 – Published: 2023-10-04 16:01 – Updated: 2025-11-03 21:49
VLAI
Title
`Cookie` HTTP header isn't stripped on cross-origin redirects
Summary
urllib3 is a user-friendly HTTP client library for Python. urllib3 doesn't treat the `Cookie` HTTP header special or provide any helpers for managing cookies over HTTP, that is the responsibility of the user. However, it is possible for a user to specify a `Cookie` header and unknowingly leak information via HTTP redirects to a different origin if that user doesn't disable redirects explicitly. This issue has been patched in urllib3 version 1.26.17 or 2.0.5.
Severity
5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N
CWE
  • CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor
Assigner
References
Impacted products
Vendor Product Version CPE status
urllib3 urllib3 Affected: >= 2.0.0, < 2.0.6
Affected: < 1.26.17
guessed Create a notification for this product.
Show details on NVD website
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            "value": "urllib3 es una librer\u00eda cliente HTTP f\u00e1cil de usar para Python. urllib3 no trata el encabezado HTTP \"Cookie\" de manera especial ni proporciona ayuda para administrar las cookies a trav\u00e9s de HTTP, eso es responsabilidad del usuario. Sin embargo, es posible que un usuario especifique un encabezado \"Cookie\" y, sin saberlo, filtre informaci\u00f3n a trav\u00e9s de redireccionamientos HTTP a un origen diferente si ese usuario no deshabilita los redireccionamientos expl\u00edcitamente. Este problema se solucion\u00f3 en urllib3 versi\u00f3n 1.26.17 o 2.0.5."
          }
        ],
        "id": "CVE-2023-43804",
        "lastModified": "2026-06-17T06:26:29.040",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "HIGH",
                "attackVector": "NETWORK",
                "availabilityImpact": "NONE",
                "baseScore": 5.9,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "HIGH",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N",
                "version": "3.1"
              },
              "exploitabilityScore": 0.7,
              "impactScore": 5.2,
              "source": "security-advisories@github.com",
              "type": "Secondary"
            },
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "NONE",
                "baseScore": 8.1,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
                "version": "3.1"
              },
              "exploitabilityScore": 2.8,
              "impactScore": 5.2,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ]
        },
        "published": "2023-10-04T17:15:10.163",
        "references": [
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            "source": "security-advisories@github.com",
            "tags": [
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          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
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              "Third Party Advisory"
            ],
            "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/I3PR7C6RJ6JUBQKIJ644DMIJSUP36VDY/"
          },
          {
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          },
          {
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            "url": "https://security.netapp.com/advisory/ntap-20241213-0007/"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "https://www.vicarius.io/vsociety/posts/cve-2023-43804-urllib3-vulnerability-3"
          }
        ],
        "sourceIdentifier": "security-advisories@github.com",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-200"
              }
            ],
            "source": "security-advisories@github.com",
            "type": "Secondary"
          },
          {
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              {
                "lang": "en",
                "value": "NVD-CWE-noinfo"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-07T13:42:37+00:00",
      "cve": "CVE-2023-43804",
      "id": "CVE-2023-43804",
      "initial_release_date": "2023-10-04T00:00:00+00:00",
      "product_status:fixed": "1878",
      "product_status:known_affected": "36",
      "product_status:known_not_affected": "80",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "python-urllib3: Cookie request header isn\u0027t stripped during cross-origin redirects",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-43804.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-20T00:11:41Z",
      "cve": "CVE-2023-43804",
      "id": "CVE-2023-43804",
      "initial_release_date": "2023-10-06T01:45:14Z",
      "product_status:known_affected": "271",
      "product_status:recommended": "449",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2023-43804",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2023-43804.json",
      "version": "71"
    }
  }
}



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Tags
Taxonomy of the tags.





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.



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.