Fastjson ≤1.2.80 Deserialization Flaw Enables Remote Code Execution – How to Protect Your Systems
A critical deserialization flaw in Fastjson versions up to 1.2.80 allows attackers to bypass autoType restrictions and achieve remote code execution, affecting Spring Cloud Alibaba Sentinel users, with mitigation steps and version-specific fixes detailed for both open‑source and commercial releases.
1. Vulnerability Overview
On May 23, an official announcement reported a new deserialization risk in Fastjson versions 1.2.80 and below. Under certain conditions the default autoType restriction can be bypassed, enabling the deserialization of unsafe classes and resulting in remote code execution.
Spring Cloud Alibaba Sentinel includes Fastjson as a transitive dependency, so affected users should apply protective measures promptly.
2. Impact Scope
Affected Versions
Fastjson ≤ 1.2.80
Unaffected Versions
Fastjson = 1.2.83
3. Mitigation Options
① Open‑Source Version
② Commercial Version
4. Fix Verification
Signed-in readers can open the original source through BestHub's protected redirect.
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