How severe is CVE-2025-67221?

CVE-2025-67221 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2025-67221 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (42nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-67221?

CVE-2025-67221 affects Ijl Orjson. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-67221?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-67221 have an EU (EUVD) identifier?

Yes. CVE-2025-67221 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-3806.

When was CVE-2025-67221 published?

CVE-2025-67221 was published on 2026-01-22 and last updated on 2026-06-17.

CVE-2025-67221

CVE-2025-67221 is a high-severity vulnerability in Ijl Orjson with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-770.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (42nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-3806
Weakness: CWE-770
Affected product: Ijl Orjson
Published: 2026-01-22
Last modified: 2026-06-17

Description

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

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 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2025-67221 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (42nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-67221?: CVE-2025-67221 affects Ijl Orjson. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-67221?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-67221 have an EU (EUVD) identifier?: Yes. CVE-2025-67221 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-3806.
When was CVE-2025-67221 published?: CVE-2025-67221 was published on 2026-01-22 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:ijl:orjson:*:*:*:*:*:python:*:*

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CVE-2024-27454 — High (CVSS 7.5): orjson.loads in orjson before 3.9.15 does not limit recursion for deeply nested JSON documents.

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