CVE-2025-57833: Django FilteredRelation SQL Injection Flaw

CVE-2025-57833 Overview

An SQL injection vulnerability was discovered in Django affecting versions 4.2 before 4.2.24, 5.1 before 5.1.12, and 5.2 before 5.2.6. The vulnerability exists in FilteredRelation's handling of column aliases, where a specially crafted dictionary passed via dictionary expansion as **kwargs to QuerySet.annotate() or QuerySet.alias() can enable SQL injection attacks. This flaw allows unauthenticated attackers to potentially execute arbitrary SQL commands against the underlying database.

Critical Impact

Unauthenticated attackers can exploit this SQL injection vulnerability to read, modify, or delete sensitive database contents, potentially leading to complete database compromise and remote code execution in certain configurations.

Affected Products

• Django 4.2 before 4.2.24
• Django 5.1 before 5.1.12
• Django 5.2 before 5.2.6

Discovery Timeline

• 2025-09-03 - Django Project releases security patch
• 2025-09-03 - CVE CVE-2025-57833 published to NVD
• 2025-11-04 - Last updated in NVD database

Technical Details for CVE-2025-57833

Vulnerability Analysis

This SQL injection vulnerability (CWE-89) exists in Django's FilteredRelation class, specifically in how it processes column aliases. The vulnerability is exploitable through the ORM's QuerySet.annotate() and QuerySet.alias() methods when they receive dictionary expansion from user-controlled input.

The flaw allows attackers to inject malicious SQL fragments through carefully constructed dictionary keys used as column aliases. When the application uses dictionary unpacking (**kwargs) to pass user-influenced data to these QuerySet methods, the column alias values are not properly sanitized before being incorporated into the generated SQL query.

While the vulnerability requires network access and the attack complexity is high due to the specific conditions needed for exploitation, successful attacks can compromise the confidentiality, integrity, and availability of the database system. The vulnerability is particularly dangerous in applications that dynamically construct annotations or aliases based on user input without proper validation.

Root Cause

The root cause of this vulnerability is insufficient input validation and sanitization of dictionary keys when they are used as column aliases in FilteredRelation. Django's ORM typically handles SQL injection protection for query values, but the column alias mechanism did not apply the same level of scrutiny to dictionary keys passed via **kwargs expansion.

When developers use patterns like queryset.annotate(**user_provided_dict) or queryset.alias(**user_provided_dict), the dictionary keys become column aliases in the SQL query. Without proper sanitization, malicious SQL fragments embedded in these keys can break out of the intended context and execute arbitrary SQL commands.

Attack Vector

The attack requires network access to an application endpoint that processes user input and passes it through dictionary expansion to Django's QuerySet.annotate() or QuerySet.alias() methods. The attacker must craft a malicious dictionary where the keys contain SQL injection payloads designed to escape the column alias context.

A successful exploit could allow attackers to:

1. Extract sensitive data from the database through UNION-based or boolean-based injection
2. Modify or delete database records
3. Execute database administrative commands
4. In certain database configurations with extended permissions, achieve remote code execution through database features like xp_cmdshell (SQL Server) or COPY TO PROGRAM (PostgreSQL)

The vulnerability mechanism involves the attacker providing input that gets processed into a dictionary structure, which is then unpacked and passed to the vulnerable QuerySet methods. The malicious column alias escapes its context in the generated SQL, allowing arbitrary SQL execution. For detailed technical analysis, see the Medium Exploit Analysis and Openwall OSS Security Post.

Detection Methods for CVE-2025-57833

Indicators of Compromise

• Unusual or malformed SQL queries in database logs containing suspicious column alias patterns
• Database error logs showing syntax errors related to annotation or alias operations
• Unexpected data access patterns or unauthorized database queries
• Web application logs showing requests with dictionary-like payloads targeting API endpoints

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect SQL injection patterns in request parameters
• Enable and monitor Django's SQL query logging for anomalous annotation and alias patterns
• Deploy database activity monitoring to detect unusual query structures targeting FilteredRelation operations
• Use application security monitoring to identify requests containing nested dictionary structures with special characters

Monitoring Recommendations

• Monitor Django application logs for errors related to QuerySet.annotate() and QuerySet.alias() operations
• Enable database audit logging to capture all SQL statements and identify injection attempts
• Set up alerts for database errors that may indicate SQL injection exploitation attempts
• Review application endpoints that accept dictionary-like input structures for potential exposure

How to Mitigate CVE-2025-57833

Immediate Actions Required

• Upgrade Django to patched versions: 4.2.24, 5.1.12, or 5.2.6 immediately
• Audit application code for usage of QuerySet.annotate() or QuerySet.alias() with user-controlled input
• Implement strict input validation for any data that may be passed to Django ORM methods
• Review and restrict database user permissions to minimize potential impact of exploitation

Patch Information

Django has released security patches addressing this vulnerability. Organizations should upgrade to the following patched versions:

• Django 4.2.24 for the 4.2.x series
• Django 5.1.12 for the 5.1.x series
• Django 5.2.6 for the 5.2.x series

Refer to the Django Security Release Notes and the Django Weblog Security Releases for complete patch details. Subscribe to the Django Announce Group for future security notifications.

Workarounds

• Validate and sanitize all dictionary keys before passing them to QuerySet.annotate() or QuerySet.alias()
• Use an allowlist approach for column alias names, rejecting any input containing special characters
• Avoid using dictionary unpacking (**kwargs) with user-controlled data in ORM operations
• Implement application-level input validation that restricts dictionary keys to alphanumeric characters and underscores only

# Upgrade Django to patched version
pip install --upgrade django>=4.2.24  # For 4.2.x users
pip install --upgrade django>=5.1.12  # For 5.1.x users
pip install --upgrade django>=5.2.6   # For 5.2.x users

# Verify installed version
python -c "import django; print(django.VERSION)"