CVE-2009-3695 Django Regex Algorithmic Complexity Causes Denial of Service
Remote attackers can cause denial of service via CPU exhaustion using crafted email or URL inputs in Django forms.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2009-3695?
CVE-2009-3695 is a medium-severity denial of service vulnerability in Djangoproject Django, published on 13 Oct 2009. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Which versions are affected by CVE-2009-3695?
5 open source packages ship an affected version, including django and Django. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
django PyPI | From 1.0 | 1.0.4, 1.1.1 |
django PyPI | From 1.0 | 1.0.4 |
django PyPI | From 1.1 | 1.1.1 |
Django PyPI | From 1.0 | 1.0.4 |
Django PyPI | From 1.1 | 1.1.1 |
Products include Djangoproject Django.
How do I fix CVE-2009-3695?
Upgrade django to a fixed version for your release line: 1.0.4 or 1.1.1.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2009-3695 being exploited?
There is no known exploitation of CVE-2009-3695 in the wild and no public exploit code.
Other vulnerabilities in Djangoproject Django
- CVE-2026-4277 Privilege abuse in GenericInlineModelAdmin
- CVE-2024-53908 Django SQL injection in HasKey(lhs, rhs) on Oracle
- CVE-2024-42005 Django SQL injection vulnerability
- CVE-2023-31047 Django bypasses validation when using one form field to upload multiple files
- CVE-2022-34265 Django `Trunc()` and `Extract()` database functions vulnerable to SQL Injection
Sources
Also known as CVE-2009-3610, DEBIAN-CVE-2009-3695, DSA-1905-1, GHSA-p6m5-h7pp-v2x5, PYSEC-2009-4.