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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,...

Basic Information

CVE State: PUBLISHED
Reserved Date: January 09, 2026
Published Date: January 09, 2026
Last Updated: January 09, 2026
Vendor: Alibaba
Product: Fastjson
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.

CVSS Scores

CVSS v3.1

10.0 - CRITICAL

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

SSVC Information

Exploitation: poc
Automatable: Yes
Technical Impact: total

Exploit Status

Exploited in the Wild: Yes (2026-06-01 10:48:34 UTC) Source

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

Known Exploited Vulnerability Information

Source	Added Date
CVE	2026-06-01 10:48:34 UTC

Timeline

CVE ID Reserved

January 09, 2026
CVE Published to Public

January 09, 2026
Added to KEVIntel

June 01, 2026