Potential denial-of-service vulnerability in django.utils.text.Truncator HTML methods

{
  "id": "e7f33981c0d5d725bdd0ec860bb3eb34508a8ff7b6d75a45bc9dad15392d0e27",
  "url": "https://osv.dev/vulnerability/CVE-2026-1285",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Potential denial-of-service vulnerability in django.utils.text.Truncator HTML methods",
    "summary": "An issue was discovered in 6.0 before 6.0.2, 5.2 before 5.2.11, and 4.2 before 4.2.28. `django.utils.text.Truncator.chars()` and `Truncator.words()` methods (with `html=True`) and the `truncatechars_html` and `truncatewords_html` template filters allow a remote attacker to cause a potential denial-of-service via crafted inputs containing a large number of unmatched HTML end tags. 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.",
    "evidence": "osv:CVE-2026-1285",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-1285",
      "aliases": [
        "BIT-django-2026-1285",
        "CVE-2026-1285",
        "GHSA-4rrr-2h4v-f3j9",
        "PYSEC-2026-45"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/django/django",
              "type": "GIT",
              "events": [
                {
                  "introduced": "97aa3b7f08f51669e118f3af5ca91026e39664c3"
                },
                {
                  "fixed": "20c71f6b91324cf401056c72136c14e0ec2bf7bf"
                },
                {
                  "introduced": "9e7cc2b628fe8fd3895986af9b7fc9525034c1b0"
                },
                {
                  "fixed": "4a96a199bbb1d3dca45ea16bf643216e179cb8bc"
                },
                {
                  "introduced": "36b5f39d9372147f0e758f590e35ee2b2bc317dd"
                },
                {
                  "fixed": "ba00558ddac694d92b05d12ecd2a5b7fcc1de025"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:djangoproject:django:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "4.2"
                      },
                      {
                        "fixed": "4.2.28"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:djangoproject:django:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "5.2"
                      },
                      {
                        "fixed": "5.2.11"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:djangoproject:django:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "6.0"
                      },
                      {
                        "fixed": "6.0.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "6.0.1",
            "5.2.10",
            "6.0",
            "5.2.9",
            "5.2.8",
            "5.2.7",
            "5.2.6",
            "5.2.5",
            "5.2.4",
            "5.2.3",
            "5.2.2",
            "5.2.1",
            "5.2"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-1285.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:26.680851165Z",
      "provider": "osv",
      "references": [
        "https://github.com/django/django/",
        "https://docs.djangoproject.com/en/dev/releases/security/",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/1xxx/CVE-2026-1285.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-1285",
        "https://www.djangoproject.com/weblog/2026/feb/03/security-releases/",
        "https://pypi.org/project/Django/",
        "https://groups.google.com/g/django-announce"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-407"
        ],
        "cna_assigner": "DSF",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/1xxx/CVE-2026-1285.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-1285",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 493472,
  "published_at": "2026-02-03T14:35:50.254+00:00"
}