CVE-2026-114138 · GHSA-33wh-fxxf-88vv
Django REST framework: Accept header with many large quoted parameters burns ~19s of CPU per request in content negotiation
- Risk score
- 62/100
- CVSS
- 7.5 v3.1
- Exploit chance (30 days)
- 0.4%
- Published
- 21 Oct 2026
Open in the live forecast Today's forecast
What to know
- What it is
- 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/media…
- Affected
- djangorestframework (pip) < 3.18.2
- Fix
- Upgrade djangorestframework to 3.18.2 or later.
- Exploitation
- No known exploitation
Story map
At a glance
djangorestframework: Amber, patch this week. 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/media…
The flaws
- CVE-2026-114138: Django REST framework: Accept header with many large quoted parameters burns ~19s of CPU per request in content negotiation (CVSS 7.5 · EPSS 0%)
- CVE-2026-114136: Django REST framework: JSONParser applies an attacker-named codec to the request stream (CVSS 7.5 · EPSS 0%)
- CVE-2026-114137: Django REST framework: TokenProxy.delete() reports success and revokes nothing (CVSS 7.4 · EPSS 0%)
The fix
Upgrade djangorestframework: 3.18.2 or later on your release line
Who is exposed: djangorestframework (pip) < 3.18.2
Where it stands
- No known exploitation
Connects to
- Same weakness: Denial of service (CWE-400). 253 other warnings in 30 days
Why it is Amber
- CVSS 7.5 high
- Remotely exploitable without logging in
- On your watchlist: PyPI
Affected packages
| Package | Ecosystem | Vulnerable | Fixed in |
|---|---|---|---|
| djangorestframework | pip | < 3.18.2 | 3.18.2 |
References
- https://github.com/advisories/GHSA-33wh-fxxf-88vv
- https://github.com/encode/django-rest-framework/security/advisories/GHSA-33wh-fxxf-88vv
- https://nvd.nist.gov/vuln/detail/CVE-2026-114138
- https://github.com/encode/django-rest-framework/commit/148ab6523922d5a0c110f76615935e5220b63029
- https://github.com/encode/django-rest-framework/releases/tag/3.18.2
- https://github.com/advisories/GHSA-33wh-fxxf-88vv
Original description
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.
Last activity 21 Oct 2026. Patch Forecast updates every hour.