High severity · published Jan 22, 2026
CVE-2025-67221
The orjson.dumps function in orjson thru 3.11.4 does not limit recursion for deeply nested JSON documents
7.5
CVSS
0.6%
EPSS
No
On KEV
Description
The orjson.dumps function in orjson thru 3.11.4 does not limit recursion for deeply nested JSON documents.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 50% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OR
Orjson · Ijl
through 3.11.4 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-67221
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-67221
Product
https://github.com/ijl/orjson
Exploit
https://github.com/kpatsakis/orjson_vulnerability
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orjson.loads in orjson before 3.9.15 does not limit recursion for deeply nested JSON documents