vulnerability · Sat 25 Jul 2026 · 16:00 UTC
Fastjson 1.x RCE Vulnerability Targeted in Attacks With No Patched Available
Filed UTCSource THN ↗
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. …
Signals
as the pipeline stamped them- High
- Critical vulnerability — CVSS 9
- What to do
- Critical severity — schedule an urgent patch.
CVE
KEV from CISA · EPSS from FIRST| Id | KEV | EPSS | Reference |
|---|---|---|---|
| CVE-2026-16723 | — | 0.66% | NVD ↗ |
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