CVE-2025-70974

Summary

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 Software

Weaknesses

• CWE-829: CWE-829 Inclusion of Functionality from Untrusted Control Sphere

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: yes
  • Technical Impact: total

fastjson: Fastjson: Remote Code Execution via JNDI Injection due to autoType mishandling

Additional References

• https://access.redhat.com/security/cve/CVE-2025-70974
• https://bugzilla.redhat.com/show_bug.cgi?id=2428203
• https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-70974.json

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

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