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The `/api/v2/csp/reports` endpoint is unauthenticated and CSRF-exempt, since it's the browser's `report-uri` target, and decoded request bodies with no size limit. This let an attacker post arbitrarily large JSON bodies to force unbounded heap allocation and OOM the server (Cure53 CDM-02-007). Wraps the request body in `http.MaxBytesReader` before decoding and returns 413 when the limit is exceeded, matching the existing convention used by `files.go`, `aitasks.go`, and `exp_chats.go`. Fixes: https://github.com/coder/security-disclosures/issues/171