CVE-2025-67221

Name: CVE-2025-67221
Creator: NVD / NIST
Published: 2026-01-22T17:16:01.433+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.55%

Last modified Jun 17, 2026

CVE-2025-67221 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. The orjson.dumps function in orjson thru 3.11.4 does not limit recursion for deeply nested JSON documents.. EPSS estimates a 0.55% chance of exploitation in the next 30 days.

Description

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

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

0.55%

41.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-770

Affected Software

Vendor	Product	Versions
Ijl	Orjson	<= 3.11.4

References

https://github.com/ijl/orjsonProduct
https://github.com/kpatsakis/orjson_vulnerabilityExploit, Third Party Advisory

Timeline

Published: Jan 22, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2025-67221?

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

How severe is CVE-2025-67221?

CVE-2025-67221 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.55% probability of exploitation in the next 30 days.

How do I fix CVE-2025-67221?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-67221?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST