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Unpatched Fastjson 1.x RCE Vulnerability Threatens Spring Boot Fat-JAR Applications

Published

26 July 2026

Topic

opportunities

Sectors

Enterprise SoftwareCybersecurity

Source

Read at rescana.com

Verified

Fusion42 · 26 July 2026 · Fusion42 review

An unpatched remote code execution vulnerability in Alibaba's Fastjson 1.2.68–1.2.83 library is being actively exploited in the wild against Spring Boot applications; it requires no authentication and allows arbitrary code execution through malicious JSON payloads.

This Wire brief sits within Fusion42's coverage of Enterprise Software and Cybersecurity. Wire is Fusion42's founder-focused intelligence feed: each story is connected to the funds and startups it names — every one with a live profile on Raise or Scout — so founders can follow the capital and the momentum behind the headline rather than just the headline itself. Wire analysis is one of the live surfaces Arthur reasons over.

◆ The Wire takeaway

If you ship a Spring Boot app using Fastjson 1.2.68–1.2.83, you have an unpatched RCE live in production right now and attackers are scanning for it. Upgrade or air-gap that endpoint this week—there is no vendor patch coming.

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Topics

Enterprise SoftwareCybersecurityfastjson-rcespring-bootjava-vulnerabilityactive-exploitationzero-day