Input validation error in React - #VU155926
Published: October 15, 2026
Vulnerability identifier: #VU155926
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to an unspecified flaw in React Server Components when processing responses that transport multiple typed arrays and an attacker-controlled value. A remote attacker can supply crafted payloads to execute arbitrary code.
Only server-side applications using a framework, bundler, or bundler plugin that supports React Server Components are affected.
Affected software
React
Remediation
Install security update from vendor's website.
React - addressed in versions 19.0.9, 19.1.10, 19.2.9, 19.3.1