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CVE-2026-27206— Zumba Json Serializer has a potential PHP Object Injection via Unrestricted @type in unserialize()

Quick assessment

Affected
zumba json-serializer
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Json Serializer for PHP是Zumba开源的一个Json序列化工具。 Json Serializer for PHP 3.2.2及之前版本存在代码问题漏洞，该漏洞源于允许通过@type字段从JSON反序列化PHP对象，可能导致PHP对象注入和潜在远程代码执行。

CVSS 8.1 · High EPSS 0.74% · P51
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I. Basic Information for CVE-2026-27206

Vulnerability Information
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Vulnerability Title
Zumba Json Serializer has a potential PHP Object Injection via Unrestricted @type in unserialize()
Source: CVE Program / CVE List V5
Vulnerability Description
Zumba Json Serializer is a library to serialize PHP variables in JSON format. In versions 3.2.2 and below, the library allows deserialization of PHP objects from JSON using a special @type field. The deserializer instantiates any class specified in the @type field without restriction. When processing untrusted JSON input, this behavior may allow an attacker to instantiate arbitrary classes available in the application. If a vulnerable application passes attacker-controlled JSON into JsonSerializer::unserialize() and contains classes with dangerous magic methods (such as __wakeup() or __destruct()), this may lead to PHP Object Injection and potentially Remote Code Execution (RCE), depending on available gadget chains in the application or its dependencies. This behavior is similar in risk profile to PHP's native unserialize() when used without the allowed_classes restriction. Applications are impacted only if untrusted or attacker-controlled JSON is passed into JsonSerializer::unserialize() and the application or its dependencies contain classes that can be leveraged as a gadget chain. This issue has been fixed in version 3.2.3. If an immediate upgrade isn't feasible, mitigate the vulnerability by never deserializing untrusted JSON with JsonSerializer::unserialize(), validating and sanitizing all JSON input before deserialization, and disabling @type-based object instantiation wherever possible.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
可信数据的反序列化
Source: CVE Program / CVE List V5
Vulnerability Title
Json Serializer for PHP 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Json Serializer for PHP是Zumba开源的一个Json序列化工具。 Json Serializer for PHP 3.2.2及之前版本存在代码问题漏洞，该漏洞源于允许通过@type字段从JSON反序列化PHP对象，可能导致PHP对象注入和潜在远程代码执行。
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)

Affected Products

Vendor Product Affected Versions CPE Subscribe
zumba json-serializer < 3.2.3 -

II. Public POCs for CVE-2026-27206

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III. Intelligence Information for CVE-2026-27206

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Patches & Fixes for CVE-2026-27206 (1)

IV. Related Vulnerabilities

Same weakness: CWE-502

V. Comments for CVE-2026-27206

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