{"id":"UBUNTU-CVE-2018-7537","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.","modified":"2026-02-04T02:18:07.707321Z","published":"2018-03-06T14:00:00Z","related":["USN-3591-1"],"upstream":["CVE-2018-7537"],"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"}],"affected":[{"package":{"name":"python-django","ecosystem":"Ubuntu:14.04:LTS","purl":"pkg:deb/ubuntu/python-django@1.6.11-0ubuntu1.2?arch=source&distro=trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.6.11-0ubuntu1.2"}]}],"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":"1.6.11-0ubuntu1.2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-7537.json"}},{"package":{"name":"python-django","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/python-django@1.8.7-1ubuntu5.6?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.8.7-1ubuntu5.6"}]}],"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"],"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"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-7537.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"},{"type":"Ubuntu","score":"medium"}]}