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Advisory record · GHSA-crf3-v9rr-v7hj

fastjson has a remote code execution (RCE) vulnerability

CVSS 9.0 CriticalCriticalEPSS 0.0066 · 51st percentile

Critical, because:

  • CVSS score 9.0: 9.0 or more.

How we decide what’s critical

Published by the GitHub Advisory Database at 23 Jul 2026, 09:32 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
com.alibaba:fastjsonMaven>=1.2.68, <=1.2.83No fixed version yet
Identifiers
GHSA-crf3-v9rr-v7hj · CVE-2026-16723
Weakness (CWE)
CWE-20 · CWE-502
Tags
Published
23 Jul 2026
Updated
10 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

fastjson versions 1.2.68 through 1.2.83 are vulnerable to remote code execution. The source says this works under the default configuration, without AutoType enabled and without a particular classpath gadget, so an attacker who can send crafted input to an affected application may be able to run code on the server. No fixed version is listed, and the source gives no workaround.

Written 2 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
9.0 Critical 3.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H CNA (alibaba)
  • CISA KEV Not listed.
  • EPSS 0.0066, the 51st percentile, on 8 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:16 UTC First seen by agentprime
  2. 31 Oct 2026, 14:16 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.