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CVE-2025-67221

HighPublished

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

Published: Jan 22, 2026
Updated: Jan 22, 2026
Assigning CNA: mitre
Evidence observed: Aug 8, 2026

Primary CVSS

7.5/ 10High

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS probability estimate

0.6%

Low · next 30 days

Percentile: 49.0%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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

Sources

CVE-2025-67221PoC
Documentation and reproduction code for CVE-2025-67221, a denial-of-service vulnerability in orjson's dumps() function caused by uncontrolled recursion when serializing deeply nested JSON data.

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