Vulnerability · Published Jan 9, 2026 · Assigned by mitre
CVE-2025-70974
Critical 10.0
In plain English
A critical-severity security flaw in Fastjson from Alibaba. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 55% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Maven | com.alibaba:fastjson | 1.2.48 | GHSA-jm7w-5684-pvh8 |
Affected products (as reported)
Weakness: CWE-829 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
References
- https://github.com/alibaba/fastjson/compare/1.2.47...1.2.48
- https://www.seebug.org/vuldb/ssvid-98020
- https://www.cnvd.org.cn/flaw/show/CNVD-2019-22238
- https://www.freebuf.com/vuls/208339.html
- https://github.com/vulhub/vulhub/tree/master/fastjson/1.2.47-rce
- https://www.cloudsek.com/blog/androxgh0st-continues-exploitation-operators-compromise-a-us-university-for-hosting-c2-logger
- https://cert.360.cn/warning/detail?id=7240aeab581c6dc2c9c5350756079955
- https://access.redhat.com/security/cve/CVE-2025-70974 vdb-entry, x_refsource_REDHAT
- RHBZ#2428203 issue-tracking, x_refsource_REDHAT
- https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-70974.json x_sadp-csaf-vex