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Fencer Vulns
high 7.5

CVE-2026-114138 json

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

published 2026-10-21 18 d ago modified 2026-10-28 11 d ago also EUVD-2026-107548 , GHSA-33wh-fxxf-88vv

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 48%
public exploits
0
none known

Summary

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.

Patch / fix

  • pypi djangorestframework 3.18.2
  • encode django_rest_framework 3.18.2
  • django-rest-framework django_rest_framework 3.18.2
  • djangorestframework Debian 14 3.18.3+ds1-1

debian advisories DEBIAN-CVE-2026-114138

  • python-djangorestframework openSUSE Tumbleweed 3.18.2-1.1

opensuse advisories openSUSE-SU-2026:12277-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-114138 updated cvss 7.5

djangorestframework: djangorestframework: Denial of Service via unbounded Accept header parsing

  • Red Hat Ansible Automation Platform 2 automation-controller 4.7.18-1.el9ap, ansible-automation-platform-26/hub-rhel9, ansible-automation-platform-27/hub-rhel9, ansible-automation-platform-26/gateway-rhel9, ansible-automation-platform-27/gateway-rhel9, python3.12-djangorestframework 3.15.1-2.el9ap, +10 more
    affected: no fix available, no fix planned “Will not fix”
  • Red Hat Satellite 6 python3-djangorestframework, satellite/iop-advisor-backend-rhel9, python-djangorestframework 3.14.0-1.el9ap, python3.12-djangorestframework 3.15.1-2.el9ap
    affected: no fix available
  • Red Hat Discovery 2 discovery/discovery-server-rhel9 1793734080
    fixed: vendor fix RHSA-2026:94802
  • Red Hat Ansible Automation Platform 2 python-djangorestframework 3.14.0-1.el9ap, python3x-djangorestframework 3.14.0-1.el8ap, python3.11-djangorestframework 3.15.1-1.el9ap, ansible-automation-platform-24/lightspeed-rhel8, ansible-automation-platform-25/lightspeed-rhel8, ansible-automation-platform/automation-dashboard-rhel9 Red Hat Discovery 2 discovery/discovery-ui-rhel9 1793733716 Red Hat Update Infrastructure 4 for Cloud Providers python-djangorestframework 3.14.0-1.el9ap
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
11 d ago

Exploit prediction

0.60% chance of exploitation in the next 30 days, higher than 48% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/encode/django-rest-framework/security/advisories/GHSA-33wh-fxxf-88vv referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
pypi djangorestframework
<3.18.2
3.18.2

Affected products

  • encode django-rest-framework

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption
  • CWE-407 Inefficient Algorithmic Complexity

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.