VulnerabilityBleeping Computer
9.0 — CRITICAL
Hackers target US firms in FastJson RCE zero-day attacks
Hackers are actively exploiting a vulnerability in the FastJson open-source Java library, allowing remote code execution without user interaction or elevated privileges. [...]
🤖 AI BriefingAuto-generated threat analysis
🔍Threat Overview
Hackers are exploiting a FastJson zero-day vulnerability (CVE-2026-16723) in US-based organizations, allowing remote code execution without user interaction or elevated privileges.
⚙️Technical Details
💥Impact Assessment
Severity: Critical
Who Is at Risk
US-based organizations in various industries, including Financial Services and Healthcare
🛡️Recommended Actions
1Enable SafeMode or switch to a non-impacted build for affected FastJson versions
2Monitor logs for suspicious activity and enable alerting on potential attacks
3Update systems with the latest security patches as soon as possible
📦Affected Products
Product Name: FastJsonVersion Range: 1.2.68-1.2.83
🔐NVD Verified DataVERIFIED
CVE-2026-16723 ↗CVSS 9 — CRITICAL
Attack Vector
NETWORK
Complexity
HIGH
Vector String
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:HWeaknesses
CWE-502CWE-20
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