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 those methods, there may be JNDI injection with an attacker-supplied payload located elsewhere in that JSON document. This was exploited in the wild in 2023 through 2025. NOTE: this issue exists because of an incomplete fix for CVE-2017-18349. Also, a later bypass is covered by CVE-2022-25845.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.008 (53.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 53.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.008 · change: +0.000
Affected products
- Alibaba Fastjson — versions 0
Weakness classification (CWE)
References
- github.com/alibaba/fastjson/compare/1.2.47...1.2.48
- www.seebug.org/vuldb/ssvid-98020
- www.cnvd.org.cn/flaw/show/CNVD-2019-22238
- www.freebuf.com/vuls/208339.html
- github.com/vulhub/vulhub/tree/master/fastjson/1.2.47-rce
- www.cloudsek.com/blog/androxgh0st-continues-exploitation-operators-compromise-a…
- cert.360.cn/warning/detail
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
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.