What is CVE-2025-67221?

CVE-2025-67221 is a high-severity vulnerability in Ijl Orjson, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2026-01-22.

How severe is CVE-2025-67221?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2025-67221 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Resource exhaustion in Ijl Orjson

CVE-2025-67221

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

EPSS: 0.005 (42.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Ijl Orjson
N/a — versions n/a

Weakness classification (CWE)

CWE-770 — Allocation of Resources Without Limits or Throttling

Public proof-of-concept exploits

kpatsakis/CVE-2025-67221

References

cve@mitre.org (Exploit, Third Party Advisory)
cve@mitre.org (Product)

Frequently asked questions

What is CVE-2025-67221?: CVE-2025-67221 is a high-severity vulnerability in Ijl Orjson, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2026-01-22.
How severe is CVE-2025-67221?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2025-67221 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.