Django REST framework: Accept header with many large quoted parameters burns ~19s of CPU per request in content negotiation

影響: pip:djangorestframework < 3.18.2 → 3.18.2

DRF's content negotiation parses each Accept token several times per request and never limits the number of tokens or their total size. Each parse ends up in Django's parse_header_parameters, which takes quadratic time when a quoted parameter value is packed with semicolons. On my machine a single GET with a 780KB Accept header made of 96 such tokens kept one gunicorn worker busy for 18.87 seconds (Django 6.1, djangorestframework 3.18.0, gunicorn 26.0.0, Python 3.13, Docker on macOS). The heade…

Read on GitHub Advisory Database

On 10/23/2026, 01:17 AM, GitHub Advisory Database published "Django REST framework: Accept header with many large quoted parameters burns ~19s of CPU per request in content negotiation" (type: Advisory). Severity is "High" (high). Related technologies: Python, Django, Docker. CVE: CVE-2026-114138.