Vulnerability-Lookup

FKIE_CVE-2020-26291

Vulnerability from fkie_nvd - Published: 2020-12-31 00:15 - Updated: 2026-06-17 03:08

Severity

6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Summary

URI.js is a javascript URL mutation library (npm package urijs). In URI.js before version 1.19.4, the hostname can be spoofed by using a backslash (`\`) character followed by an at (`@`) character. If the hostname is used in security decisions, the decision may be incorrect. Depending on library usage and attacker intent, impacts may include allow/block list bypasses, SSRF attacks, open redirects, or other undesired behavior. For example the URL `https://expected-example.com\@observed-example.com` will incorrectly return `observed-example.com` if using an affected version. Patched versions correctly return `expected-example.com`. Patched versions match the behavior of other parsers which implement the WHATWG URL specification, including web browsers and Node's built-in URL class. Version 1.19.4 is patched against all known payload variants. Version 1.19.3 has a partial patch but is still vulnerable to a payload variant.]

References

URL	Tags
security-advisories@github.com	https://github.com/medialize/URI.js/commit/b02bf037c99ac9316b77ff8bfd840e90becf1155	Patch, Third Party Advisory
security-advisories@github.com	https://github.com/medialize/URI.js/releases/tag/v1.19.4	Release Notes, Third Party Advisory
security-advisories@github.com	https://github.com/medialize/URI.js/security/advisories/GHSA-3329-pjwv-fjpg	Third Party Advisory
security-advisories@github.com	https://www.npmjs.com/package/urijs	Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://github.com/medialize/URI.js/commit/b02bf037c99ac9316b77ff8bfd840e90becf1155	Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://github.com/medialize/URI.js/releases/tag/v1.19.4	Release Notes, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://github.com/medialize/URI.js/security/advisories/GHSA-3329-pjwv-fjpg	Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://www.npmjs.com/package/urijs	Third Party Advisory

Impacted products

	Vendor	Product	Version
	uri.js_project	uri.js	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "URI.js",
          "vendor": "medialize",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.19.4"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:uri.js_project:uri.js:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "87FD3B7F-F679-49B9-9876-B50CA1A634CD",
              "versionEndExcluding": "1.19.4",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "URI.js is a javascript URL mutation library (npm package urijs). In URI.js before version 1.19.4, the hostname can be spoofed by using a backslash (`\\`) character followed by an at (`@`) character. If the hostname is used in security decisions, the decision may be incorrect. Depending on library usage and attacker intent, impacts may include allow/block list bypasses, SSRF attacks, open redirects, or other undesired behavior. For example the URL `https://expected-example.com\\@observed-example.com` will incorrectly return `observed-example.com` if using an affected version. Patched versions correctly return `expected-example.com`. Patched versions match the behavior of other parsers which implement the WHATWG URL specification, including web browsers and Node\u0027s built-in URL class. Version 1.19.4 is patched against all known payload variants. Version 1.19.3 has a partial patch but is still vulnerable to a payload variant.]"
    },
    {
      "lang": "es",
      "value": "URI.js es una biblioteca de mutaci\u00f3n de URL de JavaScript (paquete npm urijs).\u0026#xa0;En URI.js versiones anteriores a 1.19.4, el nombre de host puede ser falsificado usando un car\u00e1cter barra invertida (\"\\\") seguido de un car\u00e1cter arroba (\"@\").\u0026#xa0;Si el nombre de host es usado en decisiones de seguridad, la decisi\u00f3n puede ser incorrecta.\u0026#xa0;Dependiendo del uso de la biblioteca y la intenci\u00f3n del atacante, los impactos pueden incluir omisiones de lista de permisos y bloqueos, ataques SSRF, redireccionamientos abiertos u otros comportamientos no deseados.\u0026#xa0;Por ejemplo, la URL \"https://expected-example.com\\@observed-example.com\" devolver\u00e1 incorrectamente \"observed-example.com\" si se usa una versi\u00f3n afectada.\u0026#xa0;Las versiones parcheadas devuelven correctamente \"expected-example.com\".\u0026#xa0;Las versiones parcheadas coinciden con el comportamiento de otros analizadores que implementan la especificaci\u00f3n de URL WHATWG, incluyendo los navegadores web y la clase URL incorporada de Node.\u0026#xa0;La versi\u00f3n 1.19.4 est\u00e1 parcheada contra todas las variantes de carga \u00fatil conocidas. La versi\u00f3n 1.19.3 presenta una ruta parcial pero sigue siendo vulnerable a  una variante de carga \u00fatil."
    }
  ],
  "id": "CVE-2020-26291",
  "lastModified": "2026-06-17T03:08:00.733",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "NETWORK",
          "authentication": "SINGLE",
          "availabilityImpact": "NONE",
          "baseScore": 4.0,
          "confidentialityImpact": "NONE",
          "integrityImpact": "PARTIAL",
          "vectorString": "AV:N/AC:L/Au:S/C:N/I:P/A:N",
          "version": "2.0"
        },
        "exploitabilityScore": 8.0,
        "impactScore": 2.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 3.6,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2020-12-31T00:15:12.327",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://github.com/medialize/URI.js/commit/b02bf037c99ac9316b77ff8bfd840e90becf1155"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Release Notes",
        "Third Party Advisory"
      ],
      "url": "https://github.com/medialize/URI.js/releases/tag/v1.19.4"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://github.com/medialize/URI.js/security/advisories/GHSA-3329-pjwv-fjpg"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://www.npmjs.com/package/urijs"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://github.com/medialize/URI.js/commit/b02bf037c99ac9316b77ff8bfd840e90becf1155"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Release Notes",
        "Third Party Advisory"
      ],
      "url": "https://github.com/medialize/URI.js/releases/tag/v1.19.4"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://github.com/medialize/URI.js/security/advisories/GHSA-3329-pjwv-fjpg"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://www.npmjs.com/package/urijs"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-20"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

CVE-2020-26291 (GCVE-0-2020-26291)

Vulnerability from cvelistv5 – Published: 2020-12-30 23:40 – Updated: 2024-08-04 15:56

Title

Hostname spoofing in URI.js

Summary

Severity

6.5 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

CWE

CWE-20 - Improper Input Validation

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/medialize/URI.js/security/advi…	x_refsource_CONFIRM
https://www.npmjs.com/package/urijs	x_refsource_MISC
https://github.com/medialize/URI.js/releases/tag/…	x_refsource_MISC
https://github.com/medialize/URI.js/commit/b02bf0…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
medialize	URI.js	Affected: < 1.19.4

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-04T15:56:03.814Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_refsource_CONFIRM",
              "x_transferred"
            ],
            "url": "https://github.com/medialize/URI.js/security/advisories/GHSA-3329-pjwv-fjpg"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://www.npmjs.com/package/urijs"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://github.com/medialize/URI.js/releases/tag/v1.19.4"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://github.com/medialize/URI.js/commit/b02bf037c99ac9316b77ff8bfd840e90becf1155"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "URI.js",
          "vendor": "medialize",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.19.4"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "URI.js is a javascript URL mutation library (npm package urijs). In URI.js before version 1.19.4, the hostname can be spoofed by using a backslash (`\\`) character followed by an at (`@`) character. If the hostname is used in security decisions, the decision may be incorrect. Depending on library usage and attacker intent, impacts may include allow/block list bypasses, SSRF attacks, open redirects, or other undesired behavior. For example the URL `https://expected-example.com\\@observed-example.com` will incorrectly return `observed-example.com` if using an affected version. Patched versions correctly return `expected-example.com`. Patched versions match the behavior of other parsers which implement the WHATWG URL specification, including web browsers and Node\u0027s built-in URL class. Version 1.19.4 is patched against all known payload variants. Version 1.19.3 has a partial patch but is still vulnerable to a payload variant.]"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-20",
              "description": "CWE-20 Improper Input Validation",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2020-12-30T23:40:16.000Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/medialize/URI.js/security/advisories/GHSA-3329-pjwv-fjpg"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://www.npmjs.com/package/urijs"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/medialize/URI.js/releases/tag/v1.19.4"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/medialize/URI.js/commit/b02bf037c99ac9316b77ff8bfd840e90becf1155"
        }
      ],
      "source": {
        "advisory": "GHSA-3329-pjwv-fjpg",
        "discovery": "UNKNOWN"
      },
      "title": "Hostname spoofing in URI.js",
      "x_legacyV4Record": {
        "CVE_data_meta": {
          "ASSIGNER": "security-advisories@github.com",
          "ID": "CVE-2020-26291",
          "STATE": "PUBLIC",
          "TITLE": "Hostname spoofing in URI.js"
        },
        "affects": {
          "vendor": {
            "vendor_data": [
              {
                "product": {
                  "product_data": [
                    {
                      "product_name": "URI.js",
                      "version": {
                        "version_data": [
                          {
                            "version_value": "\u003c 1.19.4"
                          }
                        ]
                      }
                    }
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                },
                "vendor_name": "medialize"
              }
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        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
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            {
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              "value": "URI.js is a javascript URL mutation library (npm package urijs). In URI.js before version 1.19.4, the hostname can be spoofed by using a backslash (`\\`) character followed by an at (`@`) character. If the hostname is used in security decisions, the decision may be incorrect. Depending on library usage and attacker intent, impacts may include allow/block list bypasses, SSRF attacks, open redirects, or other undesired behavior. For example the URL `https://expected-example.com\\@observed-example.com` will incorrectly return `observed-example.com` if using an affected version. Patched versions correctly return `expected-example.com`. Patched versions match the behavior of other parsers which implement the WHATWG URL specification, including web browsers and Node\u0027s built-in URL class. Version 1.19.4 is patched against all known payload variants. Version 1.19.3 has a partial patch but is still vulnerable to a payload variant.]"
            }
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        },
        "impact": {
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            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N",
            "version": "3.1"
          }
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "eng",
                  "value": "CWE-20 Improper Input Validation"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "https://github.com/medialize/URI.js/security/advisories/GHSA-3329-pjwv-fjpg",
              "refsource": "CONFIRM",
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            },
            {
              "name": "https://www.npmjs.com/package/urijs",
              "refsource": "MISC",
              "url": "https://www.npmjs.com/package/urijs"
            },
            {
              "name": "https://github.com/medialize/URI.js/releases/tag/v1.19.4",
              "refsource": "MISC",
              "url": "https://github.com/medialize/URI.js/releases/tag/v1.19.4"
            },
            {
              "name": "https://github.com/medialize/URI.js/commit/b02bf037c99ac9316b77ff8bfd840e90becf1155",
              "refsource": "MISC",
              "url": "https://github.com/medialize/URI.js/commit/b02bf037c99ac9316b77ff8bfd840e90becf1155"
            }
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        },
        "source": {
          "advisory": "GHSA-3329-pjwv-fjpg",
          "discovery": "UNKNOWN"
        }
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    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2020-26291",
    "datePublished": "2020-12-30T23:40:16.000Z",
    "dateReserved": "2020-10-01T00:00:00.000Z",
    "dateUpdated": "2024-08-04T15:56:03.814Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

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.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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.