Django REST framework is a toolkit for building Web APIs. From 3.6.4 until 3.18.2, JSONParser.parse in rest_framework/parsers.py uses the client-supplied Content-Type charset value with codecs.getreader, which accepts byte-transform codecs such as bz2_codec rather than only text encodings. A remote unauthenticated client can therefore cause a compressed JSON request body to be expanded after Django has enforced DATA_UPLOAD_MAX_MEMORY_SIZE against only the wire bytes, allowing a very small request to consume substantial per-worker memory.
The default parser set is sufficient, and any reachable endpoint that accepts a JSON body is affected. This issue is fixed in version 3.18.2.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
High
Complete denial of service
CVSS Vector v3.1
Weakness Type (CWE)
Vulnerable Products
encode:django-rest-framework
References 3
https://github.com/encode/django-rest-framework/security/advisories/GHSA-3547-9…
https://github.com/encode/django-rest-framework/security/advisories/GHSA-3547-9m27-7rxg
https://github.com/encode/django-rest-framework/commit/3c2634599b26a9f789b03045…
https://github.com/encode/django-rest-framework/commit/3c2634599b26a9f789b03045118dbc276117611a
https://github.com/encode/django-rest-framework/releases/tag/3.18.2
https://github.com/encode/django-rest-framework/releases/tag/3.18.2