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CVE-2025-70974

Quick assessment

Affected
Alibaba Fastjson
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Fastjson是Alibaba开源的一款基于Java的快速JSON解析器/生成器。 Fastjson 1.2.48之前版本存在安全漏洞，该漏洞源于自动类型处理不当，可能导致JNDI注入攻击。

CVSS 10.0 · Critical EPSS 0.77% · P54

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
Alibaba Fastjson < 1.2.48 affected
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I. Basic Information for CVE-2025-70974

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
从非可信控制范围包含功能例程
Source: CVE Program / CVE List V5
Vulnerability Title
Fastjson 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Fastjson是Alibaba开源的一款基于Java的快速JSON解析器/生成器。 Fastjson 1.2.48之前版本存在安全漏洞，该漏洞源于自动类型处理不当，可能导致JNDI注入攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Shenlong Deep Dive — AI Deep Analysis

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Affected Products

Vendor Product Affected Versions CPE Subscribe
Alibaba Fastjson 0 ~ 1.2.48 -

II. Public POCs for CVE-2025-70974

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Reproduced successfully in a real sandbox · Below is the actual recording of building the environment and exploiting the vulnerability.
Success marker: VULNERABLE: Fastjson autoType deserialization RCE confirmed - exfiltrated PROOF_cc62116384f6376d via @type class instantiation and setter method invocation
Reproduction recording is a Pro+ exclusive
Watch the full sandbox build + live exploit recording for this CVE. Limited-time ¥499/mo.
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claude_code · 12089 chars
GitHub 复现环境（可 clone 直接跑）
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III. Intelligence Information for CVE-2025-70974

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Patches & Fixes for CVE-2025-70974 (1)

Proof of Concept for CVE-2025-70974 (1)

Security Blog Posts for CVE-2025-70974 (1)

Other References for CVE-2025-70974 (1)

IV. Related Vulnerabilities

Same product: Fastjson
Same vendor: Alibaba
Same weakness: CWE-829

V. Comments for CVE-2025-70974

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