{"cve":"CVE-2009-3695","nvd":{"published":"2009-10-13T10:30:00.767","modified":"2026-06-16T23:12:10.017","status":"Modified","description":"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.","cvss_v4":null,"cvss_v3":null,"cwes":[],"references":["http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=550457","http://groups.google.com/group/django-users/browse_thread/thread/15df9e45118dfc51/","http://secunia.com/advisories/36948","http://secunia.com/advisories/36968","http://www.debian.org/security/2009/dsa-1905"],"products":["djangoproject:django"],"source":"nvd","synced_at":"2026-10-19T19:54:26.868835795+00:00"},"epss":{"cve":"CVE-2009-3695","score":0.03717,"percentile":0.89781,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-p6m5-h7pp-v2x5","url":"https://osv.dev/vulnerability/GHSA-p6m5-h7pp-v2x5","summary":"Django Regex Algorithmic Complexity Causes Denial of Service","modified":"2024-09-16T22:19:33.821208Z","packages":[{"ecosystem":"PyPI","name":"django","purl":"pkg:pypi/django","ranges":[">=1.0 <1.0.4"],"fixed":["1.0.4"]},{"ecosystem":"PyPI","name":"django","purl":"pkg:pypi/django","ranges":[">=1.1 <1.1.1"],"fixed":["1.1.1"]}]},{"id":"PYSEC-2009-4","url":"https://osv.dev/vulnerability/PYSEC-2009-4","summary":"","modified":"2026-06-10T17:00:51.151045095Z","packages":[{"ecosystem":"PyPI","name":"django","purl":"pkg:pypi/django","ranges":[">=1.0 <1.0.4",">=1.1 <1.1.1"],"fixed":["1.0.4","1.1.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}