ubuntu-cve-2018-7537
Vulnerability from osv_ubuntu
Published
2018-03-06 14:00
Modified
2025-09-08 16:44
Summary
Details

An issue was discovered in Django 2.0 before 2.0.3, 1.11 before 1.11.11, and 1.8 before 1.8.19. If django.utils.text.Truncator's chars() and words() methods were passed the html=True argument, they were extremely slow to evaluate certain inputs due to a catastrophic backtracking vulnerability in a regular expression. The chars() and words() methods are used to implement the truncatechars_html and truncatewords_html template filters, which were thus vulnerable.

Severity
5.3 (Medium)
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "python-django",
            "binary_version": "1.6.11-0ubuntu1.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:14.04:LTS",
        "name": "python-django",
        "purl": "pkg:deb/ubuntu/python-django@1.6.11-0ubuntu1.2?arch=source\u0026distro=trusty"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.6.11-0ubuntu1.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.5.4-1ubuntu1",
        "1.6-1",
        "1.6.1-1",
        "1.6.1-2",
        "1.6.1-2ubuntu0.1",
        "1.6.1-2ubuntu0.2",
        "1.6.1-2ubuntu0.3",
        "1.6.1-2ubuntu0.4",
        "1.6.1-2ubuntu0.5",
        "1.6.1-2ubuntu0.6",
        "1.6.1-2ubuntu0.8",
        "1.6.1-2ubuntu0.9",
        "1.6.1-2ubuntu0.10",
        "1.6.1-2ubuntu0.11",
        "1.6.1-2ubuntu0.12",
        "1.6.1-2ubuntu0.13",
        "1.6.1-2ubuntu0.14",
        "1.6.1-2ubuntu0.15",
        "1.6.1-2ubuntu0.16",
        "1.6.11-0ubuntu1",
        "1.6.11-0ubuntu1.1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "python-django",
            "binary_version": "1.8.7-1ubuntu5.6"
          },
          {
            "binary_name": "python-django-common",
            "binary_version": "1.8.7-1ubuntu5.6"
          },
          {
            "binary_name": "python3-django",
            "binary_version": "1.8.7-1ubuntu5.6"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "python-django",
        "purl": "pkg:deb/ubuntu/python-django@1.8.7-1ubuntu5.6?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.8.7-1ubuntu5.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.7.9-1ubuntu5",
        "1.8.5-2ubuntu1",
        "1.8.7-1ubuntu1",
        "1.8.7-1ubuntu2",
        "1.8.7-1ubuntu3",
        "1.8.7-1ubuntu4",
        "1.8.7-1ubuntu5",
        "1.8.7-1ubuntu5.1",
        "1.8.7-1ubuntu5.2",
        "1.8.7-1ubuntu5.4",
        "1.8.7-1ubuntu5.5"
      ]
    }
  ],
  "aliases": [],
  "details": "An issue was discovered in Django 2.0 before 2.0.3, 1.11 before 1.11.11, and 1.8 before 1.8.19. If django.utils.text.Truncator\u0027s chars() and words() methods were passed the html=True argument, they were extremely slow to evaluate certain inputs due to a catastrophic backtracking vulnerability in a regular expression. The chars() and words() methods are used to implement the truncatechars_html and truncatewords_html template filters, which were thus vulnerable.",
  "id": "UBUNTU-CVE-2018-7537",
  "modified": "2025-09-08T16:44:47Z",
  "published": "2018-03-06T14:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2018-7537"
    },
    {
      "type": "REPORT",
      "url": "https://www.djangoproject.com/weblog/2018/mar/06/security-releases/"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-3591-1"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2018-7537"
    }
  ],
  "related": [
    "USN-3591-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2018-7537"
  ]
}



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