Fastjson 1.x RCE Vulnerability Targeted in Attacks With No Patched Available

Security firms ThreatBook and Imperva say attackers are targeting a critical flaw in Fastjson, Alibaba's JSON library for Java. In affected Spring Boot applications, a malicious JSON request can execute code without authentication, with the privileges of the Java process.

Tracked as CVE-2026-16723, the vulnerability carries an Alibaba-assigned CVSS score of 9.0. The confirmed chain requires

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https://thehackernews.com/2026/07/fastjson-1x-rce-vulnerability-targeted.html

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https://thehackernews.com/2026/07/fastjson-1x-rce-vulnerability-targeted.html

id: 2228
uid: I4H0q
insdate: 2026-07-25 14:10:05
title: Fastjson 1.x RCE Vulnerability Targeted in Attacks With No Patched Available
additional: Security firms ThreatBook and Imperva say attackers are targeting a critical flaw in Fastjson, Alibaba's JSON library for Java. In affected Spring Boot applications, a malicious JSON request can execute code without authentication, with the privileges of the Java process.

Tracked as CVE-2026-16723, the vulnerability carries an Alibaba-assigned CVSS score of 9.0. The confirmed chain requires
category: Cybersecurity
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