CVE-2026-16723

CRITICAL

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 require...

Affects 1 product across 1 vendor.

CVSS 3.19.0
EPSS0.7%
Percentile51th
PatchUnknown
CVSS Vector — Plain English Remotely exploitable over the network, high complexity, no authentication required, no user interaction needed, can impact systems beyond the vulnerable component, full confidentiality impact, full integrity impact, full availability impact.
CWE Weakness Definitions
CWE-20: Improper Input Validation

Software does not validate or incorrectly validates input, allowing attackers to craft data processed in unintended ways.

CWE-502: Deserialization of Untrusted Data

Software deserializes untrusted data without validation, allowing crafted objects to execute arbitrary code.

Related Attack Patterns (CAPEC)
CAPEC-3 Using Leading 'Ghost' Character Sequences to Bypass Input Filters
via CWE-20
CAPEC-7 Blind SQL Injection
via CWE-20
CAPEC-8 Buffer Overflow in an API Call
via CWE-20
CAPEC-9 Buffer Overflow in Local Command-Line Utilities
via CWE-20
CAPEC-10 Buffer Overflow via Environment Variables
via CWE-20
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Mapping is CWE-to-CAPEC per MITRE CAPEC 3.9.

◆ AI Analysis — automated analysis, not human-reviewed

A critical severity vulnerability (CVE-2026-16723) affects the target system. 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.

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Frequently Asked Questions
What is CVE-2026-16723?
A critical severity vulnerability (CVE-2026-16723) affects the target system. 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.
What is the CVSS score for CVE-2026-16723?
CVE-2026-16723 has CVSS 9.0 (Critical). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H. EPSS: 0.7%.
Is CVE-2026-16723 actively exploited?
No confirmed active exploitation of CVE-2026-16723 as of 2026-07-24.
How do I remediate CVE-2026-16723?
Apply vendor patches for CVE-2026-16723. Monitor Alibaba advisories.
What systems are affected by CVE-2026-16723?
CVE-2026-16723 affects Alibaba Fastjson.
Vulnerability Details
CVE IDCVE-2026-16723
CVSS VectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Published2026-07-23
Last Modified2026-07-23
ICS Relevance15%
Weakness (CWE)
Improper Input ValidationDeserialization of Untrusted Data
SourceNVD
Official Description

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.

Source: NIST NVD / MITRE CVE Database

Affected Products
VendorProductAffected Versions
Alibaba Fastjson ≥ 1.2.68, ≤ 1.2.83
Remediation

No official vendor advisory link on record. See the CVE record →

Threat Intelligence
● Threat Intelligence Validated: October 2026 | Threat Age: 85 Days
CISA known-exploitedNot in KEV catalog
Public ExploitNot confirmed
PoC CodeNot confirmed
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