{"cve":"CVE-2026-114138","nvd":{"published":"2026-10-21T21:17:56.200","modified":"2026-10-22T17:34:37.867","status":"Awaiting Analysis","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-400","CWE-407"],"references":["https://github.com/encode/django-rest-framework/commit/148ab6523922d5a0c110f76615935e5220b63029","https://github.com/encode/django-rest-framework/releases/tag/3.18.2","https://github.com/encode/django-rest-framework/security/advisories/GHSA-33wh-fxxf-88vv"],"products":[],"source":"nvd","synced_at":"2026-10-23T16:39:28.036610720+00:00"},"epss":{"cve":"CVE-2026-114138","score":0.0052,"percentile":0.43917,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-33wh-fxxf-88vv","url":"https://osv.dev/vulnerability/GHSA-33wh-fxxf-88vv","summary":"Django REST framework: Accept header with many large quoted parameters burns ~19s of CPU per request in content negotiation","modified":"2026-10-22T16:30:29.911203144Z","packages":[{"ecosystem":"PyPI","name":"djangorestframework","purl":"pkg:pypi/djangorestframework","ranges":["<3.18.2"],"fixed":["3.18.2"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}