PyPI/orjson CVE-2025-67221: high, EPSS 0.63%

orjson does not limit recursion for deeply nested JSON documents

Action: Upgrade orjson to 3.11.6 or later.

pip install orjson==3.11.6

Affected

Fixed versions

Sources

• osv: GHSA-hx9q-6w63-j58v
• https://nvd.nist.gov/vuln/detail/CVE-2025-67221
• https://github.com/ijl/orjson/issues/620
• https://github.com/kpatsakis/CVE-2025-67221/issues/1
• https://github.com/ijl/orjson/commit/62bb185b70785ded49c79c26f8c9781f1e6fe370
• https://github.com/ijl/orjson
• https://github.com/kpatsakis/orjson_vulnerability
• https://github.com/pypa/advisory-database/tree/main/vulns/orjson/PYSEC-2026-107.yaml

CVE-2025-67221 · published 2026-01-22T18:30:33Z · modified 2026-09-10T03:50:33.258377926Z · JSON