---
title: "CVE-2026-16723: fastjson has a remote code execution (RCE) vulnerability"
url: https://erroneo.us/security/cve/CVE-2026-16723/
description: "CVE-2026-16723 (com.alibaba:fastjson (Maven)): A remote code execution (RCE) vulnerability exists in fastjson 1.2.68 through 1.2.83. This vulnerability is…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-07-23
date_modified: 2026-08-07
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-16723"
kev: false
cvss: 9
epss: 0.00663
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-16723: fastjson has a remote code execution (RCE) vulnerability

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.7% , percentile 51: FIRST’s model estimates a 0.7% chance of exploitation activity in the next 30 days, higher than 51% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes com.alibaba:fastjson (Maven) >= 1.2.68, <= 1.2.83, no fixed version listed . Check your lockfile, including transitive dependencies.

## What it is

A remote code execution (RCE) vulnerability exists in fastjson 1.2.68 through 1.2.83. This vulnerability is exploitable under fastjson's stock default configuration — no AutoType enablement required, no classpath gadget required.

## Affected packages

- Maven `com.alibaba:fastjson` >= 1.2.68, <= 1.2.83 → fixed: none listed

## Affected products (CVE record)

- Alibaba Fastjson: 1.2.68 <= 1.2.83

## Severity

- alibaba CVSS 3.1: 9 `CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H`
- GitHub CVSS 3.1: 9.0 `CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable no , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.66% probability of exploitation activity in the next 30 days; percentile 51.

## Sources

- [github.com](https://github.com/alibaba/fastjson2/wiki/Security-Advisory:-Remote-Code-Execution-in-fastjson-1.2.68%E2%80%931.2.83)
- [GitHub Advisory GHSA-crf3-v9rr-v7hj](https://github.com/advisories/GHSA-crf3-v9rr-v7hj)
- [CVE.org record CVE-2026-16723](https://www.cve.org/CVERecord?id=CVE-2026-16723)
- [NVD entry CVE-2026-16723](https://nvd.nist.gov/vuln/detail/CVE-2026-16723)

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Source page: https://erroneo.us/security/cve/CVE-2026-16723/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt