CVE-2025-67221: Ijl orjson allocation without limits vulnerability

Ijl · Orjson

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

7.5 CVSS 3.1 High EPSS 0.64% · top 51.3% CWE-770 · Allocation without limits

7.5CVSS 3.1 base score

0.64%EPSS exploitation probability, 30 days

NoNot in CISA KEV

1Affected product versions listed by NVD

2References, 1 tagged exploit

17 Jun 2026Last modified by NVD

Description

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

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

Orjson Ijl

References

Link	Tags
https://github.com/ijl/orjson	Product
https://github.com/kpatsakis/orjson_vulnerability	ExploitThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

7.5CVE-2024-27454Ijl orjson vulnerabilityorjson.loads in orjson before 3.9.15 does not limit recursion for deeply nested JSON documents.EPSS 1.2%26 Feb 2024 8.6CVE-2020-3569Cisco IOS XR DVMRP IGMP packet handling memory exhaustionCisco IOS XR Software mishandles IGMP packets in its Distance Vector Multicast Routing Protocol (DVMRP) feature, allowing crafted traffic to crash th…KEVEPSS 3.3%analysed23 Sep 2020 8.6CVE-2020-3566Cisco IOS XR DVMRP IGMP queue flaw causes memory exhaustionCisco IOS XR Software mishandles queue management for IGMP packets in its DVMRP feature, allowing uncontrolled memory consumption. An unauthenticated…KEVEPSS 3.7%analysed29 Aug 2020

Source: NIST National Vulnerability Database (record CVE-2025-67221), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.