{"id":"PYSEC-2009-4","details":"Algorithmic complexity vulnerability in the forms library in Django 1.0 before 1.0.4 and 1.1 before 1.1.1 allows remote attackers to cause a denial of service (CPU consumption) via a crafted (1) EmailField (email address) or (2) URLField (URL) that triggers a large amount of backtracking in a regular expression.","aliases":["CVE-2009-3695","GHSA-p6m5-h7pp-v2x5"],"modified":"2026-06-10T17:00:51.151045095Z","published":"2009-10-13T10:30:00Z","references":[{"type":"WEB","url":"http://www.securityfocus.com/bid/36655"},{"type":"WEB","url":"http://groups.google.com/group/django-users/browse_thread/thread/15df9e45118dfc51/"},{"type":"ADVISORY","url":"http://secunia.com/advisories/36948"},{"type":"ADVISORY","url":"http://www.debian.org/security/2009/dsa-1905"},{"type":"WEB","url":"http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=550457"},{"type":"ADVISORY","url":"http://www.vupen.com/english/advisories/2009/2871"},{"type":"ARTICLE","url":"http://www.djangoproject.com/weblog/2009/oct/09/security/"},{"type":"ADVISORY","url":"http://secunia.com/advisories/36968"},{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2009/10/13/6"},{"type":"WEB","url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/53727"},{"type":"ADVISORY","url":"https://github.com/advisories/GHSA-p6m5-h7pp-v2x5"}],"affected":[{"package":{"name":"django","ecosystem":"PyPI","purl":"pkg:pypi/django"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.0"},{"fixed":"1.0.4"},{"introduced":"1.1"},{"fixed":"1.1.1"}]}],"versions":["1.0.1","1.0.2","1.0.3","1.1"],"database_specific":{"source":"https://github.com/pypa/advisory-database/blob/main/vulns/django/PYSEC-2009-4.yaml"}}],"schema_version":"1.7.5"}