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CVE-2026-16723 is a critical remote code execution vulnerability in Alibaba Fastjson 1.x affecting versions 1.2.68 through 1.2.83. The flaw is exploitable under the library’s default configuration and does not require AutoType to be enabled or any third-party gadget class on the application classpath. Exploitation abuses Fastjson’s polymorphic deserialization and internal type-resolution logic through attacker-controlled @type values. In affected Spring Boot executable fat-JAR deployments, nested JAR URL handling and trust decisions involving @JSONType can be leveraged to bypass expected type restrictions and reach code execution. The issue has been verified across Spring Boot 2.x, 3.x, and 4.x environments and on JDK 8, 11, 17, and 21.
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A critical remote code execution vulnerability in Alibaba Fastjson 1.x caused by unsafe type-resolution/deserialization behavior that can be exploited via crafted @type values, including in Spring Boot fat-JAR deployments, allowing unauthenticated attackers to achieve code execution.
A critical unauthenticated remote code execution vulnerability in FastJson 1.x that affects versions 1.2.68 through 1.2.83 in certain Spring Boot fat-JAR deployments, allowing malicious JSON deserialization to bypass normal type restrictions and achieve code execution.
A remote code execution vulnerability in Alibaba Fastjson affecting versions 1.2.68 through 1.2.83, exploitable under the default configuration without requiring AutoType enablement or a classpath gadget.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.