encode Django REST Framework up to 3.18.1 MediaType Parser negotiation.py DefaultContentNegotiation.get_accept_list resource consumption

Summaryinfo

A vulnerability was found in encode Django REST Framework up to 3.18.1. It has been declared as problematic. Impacted is the function DefaultContentNegotiation.get_accept_list of the file rest_framework/negotiation.py of the component MediaType Parser. Executing a manipulation can lead to resource consumption. This vulnerability is registered as CVE-2026-114138. It is possible to launch the attack remotely. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in encode Django REST Framework up to 3.18.1. This vulnerability affects the function DefaultContentNegotiation.get_accept_list of the file rest_framework/negotiation.py of the component MediaType Parser. The manipulation with an unknown input leads to a resource consumption vulnerability. The CWE definition for the vulnerability is CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. As an impact it is known to affect availability. CVE summarizes:

Django REST framework is a toolkit for building Web APIs. Prior to 3.18.2, DefaultContentNegotiation.get_accept_list in rest_framework/negotiation.py accepts an unbounded number and aggregate size of Accept tokens, while select_renderer in that file repeatedly invokes _MediaType parsing from rest_framework/utils/mediatypes.py for each attacker-controlled token, every renderer, and forced 406 renegotiation. A remote unauthenticated client can send many distinct media types containing large quoted parameter values with numerous semicolons, causing Django's parameter parser and DRF's repeated parsing structure to consume disproportionate CPU. Requests to any reachable endpoint can pin synchronous workers for prolonged periods, and concurrent requests can make the service unavailable until the requests stop. This issue is fixed in version 3.18.2.

The advisory is available at github.com. This vulnerability was named CVE-2026-114138 since 10/20/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

Upgrading to version 3.18.2 eliminates this vulnerability.

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Productinfo

Type

• Content Management System

Vendor

• encode

Name

• Django REST Framework

Version

• 3.18.0
• 3.18.1

License

• open-source

CPE 2.3info

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CPE 2.2info

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