CVE-2011-4137: Djangoproject Django

Medium severity, CVSS 5.0. EPSS: 3% chance of exploitation in the next 30 days.

The verify_exists functionality in the URLField implementation in Django before 1.2.7 and 1.3.x before 1.3.1 relies on Python libraries that attempt access to an arbitrary URL with no timeout, which allows remote attackers to cause a denial of service (resource consumption) via a URL associated with (1) a slow response, (2) a completed TCP connection with no application data sent, or (3) a large amount of application data, a related issue to CVE-2011-1521.

Affected products

• Djangoproject Django: up to and including 1.2.6; version 0.91 only; version 0.95 only; version 0.95.1 only; version 0.96 only; version 1.0 only; …

Published 2011-10-19. Last modified 2026-06-16.