Vulnerability-Lookup

Vulnerability from bitnami_vulndb

Published

2026-03-06 08:38

Modified

2026-03-06 09:10

Summary

Potential denial-of-service vulnerability in URLField via Unicode normalization on Windows

Details

An issue was discovered in 6.0 before 6.0.3, 5.2 before 5.2.12, and 4.2 before 4.2.29. URLField.to_python() in Django calls urllib.parse.urlsplit(), which performs NFKC normalization on Windows that is disproportionately slow for certain Unicode characters, allowing a remote attacker to cause denial of service via large URL inputs containing these characters. Earlier, unsupported Django series (such as 5.0.x, 4.1.x, and 3.2.x) were not evaluated and may also be affected. Django would like to thank Seokchan Yoon for reporting this issue.

JSON

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Bitnami",
        "name": "django",
        "purl": "pkg:bitnami/django"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.2.0"
            },
            {
              "fixed": "4.2.29"
            },
            {
              "introduced": "5.2.0"
            },
            {
              "fixed": "5.2.12"
            },
            {
              "introduced": "6.0.0"
            },
            {
              "fixed": "6.0.3"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "severity": [
        {
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "type": "CVSS_V3"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-25673"
  ],
  "database_specific": {
    "cpes": [
      "cpe:2.3:a:djangoproject:django:*:*:*:*:*:*:*:*"
    ],
    "severity": "High"
  },
  "details": "An issue was discovered in 6.0 before 6.0.3, 5.2 before 5.2.12, and 4.2 before 4.2.29.\n`URLField.to_python()` in Django calls `urllib.parse.urlsplit()`, which performs NFKC normalization on Windows that is disproportionately slow for certain Unicode characters, allowing a remote attacker to cause denial of service via large URL inputs containing these characters.\nEarlier, unsupported Django series (such as 5.0.x, 4.1.x, and 3.2.x) were not evaluated and may also be affected.\nDjango would like to thank Seokchan Yoon for reporting this issue.",
  "id": "BIT-django-2026-25673",
  "modified": "2026-03-06T09:10:26.160Z",
  "published": "2026-03-06T08:38:49.880Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://docs.djangoproject.com/en/dev/releases/security/"
    },
    {
      "type": "WEB",
      "url": "https://groups.google.com/g/django-announce"
    },
    {
      "type": "WEB",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-25673"
    },
    {
      "type": "WEB",
      "url": "https://www.djangoproject.com/weblog/2026/mar/03/security-releases/"
    }
  ],
  "schema_version": "1.6.2",
  "summary": "Potential denial-of-service vulnerability in URLField via Unicode normalization on Windows"
}

CVE-2026-25673 (GCVE-0-2026-25673)

Vulnerability from cvelistv5 – Published: 2026-03-03 14:28 – Updated: 2026-03-03 15:26

Title

Potential denial-of-service vulnerability in URLField via Unicode normalization on Windows

Summary

An issue was discovered in 6.0 before 6.0.3, 5.2 before 5.2.12, and 4.2 before 4.2.29. `URLField.to_python()` in Django calls `urllib.parse.urlsplit()`, which performs NFKC normalization on Windows that is disproportionately slow for certain Unicode characters, allowing a remote attacker to cause denial of service via large URL inputs containing these characters. Earlier, unsupported Django series (such as 5.0.x, 4.1.x, and 3.2.x) were not evaluated and may also be affected. Django would like to thank Seokchan Yoon for reporting this issue.

Severity ?

No CVSS data available.

CWE

CWE-400 - Uncontrolled Resource Consumption

Assigner

DSF

References

URL

Tags

	https://docs.djangoproject.com/en/dev/releases/se…	vendor-advisory
	https://groups.google.com/g/django-announce	mailing-list
	https://www.djangoproject.com/weblog/2026/mar/03/…	vendor-advisory

Impacted products

	Vendor	Product	Version
	djangoproject	Django	Affected: 6.0 , < 6.0.3 (semver) Unaffected: 6.0.3 (semver) Affected: 5.2 , < 5.2.12 (semver) Unaffected: 5.2.12 (semver) Affected: 4.2 , < 4.2.29 (semver) Unaffected: 4.2.29 (semver)

Credits

Seokchan Yoon Natalia Bidart Natalia Bidart

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "HIGH",
              "baseScore": 7.5,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-25673",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-03-03T15:25:53.980126Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-03-03T15:26:02.764Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://pypi.org/project/Django/",
          "defaultStatus": "unaffected",
          "packageName": "django",
          "product": "Django",
          "repo": "https://github.com/django/django/",
          "vendor": "djangoproject",
          "versions": [
            {
              "lessThan": "6.0.3",
              "status": "affected",
              "version": "6.0",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.0.3",
              "versionType": "semver"
            },
            {
              "lessThan": "5.2.12",
              "status": "affected",
              "version": "5.2",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.2.12",
              "versionType": "semver"
            },
            {
              "lessThan": "4.2.29",
              "status": "affected",
              "version": "4.2",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "4.2.29",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "reporter",
          "value": "Seokchan Yoon"
        },
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "Natalia Bidart"
        },
        {
          "lang": "en",
          "type": "coordinator",
          "value": "Natalia Bidart"
        }
      ],
      "datePublic": "2026-03-03T08:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eAn issue was discovered in 6.0 before 6.0.3, 5.2 before 5.2.12, and 4.2 before 4.2.29.\u003c/p\u003e\u003cp\u003e`URLField.to_python()` in Django calls `urllib.parse.urlsplit()`, which performs NFKC normalization on Windows that is disproportionately slow for certain Unicode characters, allowing a remote attacker to cause denial of service via large URL inputs containing these characters.\u003c/p\u003e\u003cp\u003eEarlier, unsupported Django series (such as 5.0.x, 4.1.x, and 3.2.x) were not evaluated and may also be affected.\u003c/p\u003e\u003cp\u003eDjango would like to thank Seokchan Yoon for reporting this issue.\u003c/p\u003e"
            }
          ],
          "value": "An issue was discovered in 6.0 before 6.0.3, 5.2 before 5.2.12, and 4.2 before 4.2.29.\n`URLField.to_python()` in Django calls `urllib.parse.urlsplit()`, which performs NFKC normalization on Windows that is disproportionately slow for certain Unicode characters, allowing a remote attacker to cause denial of service via large URL inputs containing these characters.\nEarlier, unsupported Django series (such as 5.0.x, 4.1.x, and 3.2.x) were not evaluated and may also be affected.\nDjango would like to thank Seokchan Yoon for reporting this issue."
        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-227",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-227: Sustained Client Engagement"
            }
          ]
        }
      ],
      "metrics": [
        {
          "other": {
            "content": {
              "namespace": "https://docs.djangoproject.com/en/dev/internals/security/#security-issue-severity-levels",
              "value": "moderate"
            },
            "type": "Django severity rating"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-400",
              "description": "CWE-400: Uncontrolled Resource Consumption",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-03T14:28:28.601Z",
        "orgId": "6a34fbeb-21d4-45e7-8e0a-62b95bc12c92",
        "shortName": "DSF"
      },
      "references": [
        {
          "name": "Django security archive",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://docs.djangoproject.com/en/dev/releases/security/"
        },
        {
          "name": "Django releases announcements",
          "tags": [
            "mailing-list"
          ],
          "url": "https://groups.google.com/g/django-announce"
        },
        {
          "name": "Django security releases issued: 6.0.3, 5.2.12, and 4.2.29",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://www.djangoproject.com/weblog/2026/mar/03/security-releases/"
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "timeline": [
        {
          "lang": "en",
          "time": "2026-01-27T12:00:00.000Z",
          "value": "Initial report received."
        },
        {
          "lang": "en",
          "time": "2026-02-20T12:00:00.000Z",
          "value": "Vulnerability confirmed."
        },
        {
          "lang": "en",
          "time": "2026-03-03T08:00:00.000Z",
          "value": "Security release issued."
        }
      ],
      "title": "Potential denial-of-service vulnerability in URLField via Unicode normalization on Windows",
      "x_generator": {
        "engine": "cvelib 1.8.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "6a34fbeb-21d4-45e7-8e0a-62b95bc12c92",
    "assignerShortName": "DSF",
    "cveId": "CVE-2026-25673",
    "datePublished": "2026-03-03T14:28:28.601Z",
    "dateReserved": "2026-02-04T18:27:10.657Z",
    "dateUpdated": "2026-03-03T15:26:02.764Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

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.

Action not permitted

Vulnerability from bitnami_vulndb

CVE-2026-25673 (GCVE-0-2026-25673)

Tags

Sightings

Nomenclature