CVE-2025-67221: orjson does not limit recursion for deeply nested JSON documents

January 22, 2026 (updated January 23, 2026)

The orjson.dumps function in orjson thru 3.11.4 does not limit recursion for deeply nested JSON documents.

References

github.com/advisories/GHSA-hx9q-6w63-j58v
github.com/ijl/orjson
github.com/ijl/orjson/issues/620
github.com/kpatsakis/CVE-2025-67221/issues/1
github.com/kpatsakis/orjson_vulnerability
nvd.nist.gov/vuln/detail/CVE-2025-67221

Code Behaviors & Features

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