What is CVE-2025-70974?

CVE-2025-70974 is a critical-severity vulnerability in Alibaba Fastjson, classified under Inclusion of Functionality from Untrusted Control Sphere. CVSS score: 10.0/10. Published 2026-01-09.

How severe is CVE-2025-70974?

Critical severity. CVSS v3 base score is 10.0 out of 10.

Vulnerability in Alibaba Fastjson

CVE-2025-70974

Fastjson before 1.2.48 mishandles autoType because, when an @type key is in a JSON document, and the value of that key is the name of a Java class, there may be calls to certain public methods of that class. Depending on the behavior of th…

EPSS: 0.007 (48.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.

Affected products

Alibaba Fastjson — versions 0

Weakness classification (CWE)

CWE-829 — Inclusion of Functionality from Untrusted Control Sphere

References

cve@mitre.org
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cve@mitre.org
cve@mitre.org
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Frequently asked questions

What is CVE-2025-70974?: CVE-2025-70974 is a critical-severity vulnerability in Alibaba Fastjson, classified under Inclusion of Functionality from Untrusted Control Sphere. CVSS score: 10.0/10. Published 2026-01-09.
How severe is CVE-2025-70974?: Critical severity. CVSS v3 base score is 10.0 out of 10.