#VU124547 Creation of chroot Jail Without Changing Working Directory in Node.js - CVE-2026-21717
Published: March 25, 2026
Vulnerability identifier: #VU124547
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-21717
CWE-ID: CWE-243
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Node.js
Node.js
Software vendor:
Node.js Foundation
Node.js Foundation
Description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to predictable hash collisions in V8's string hashing mechanism when processing integer-like strings. A remote attacker can craft input with many colliding keys, degrading performance during JSON.parse() or other operations that internalize strings.
The most common trigger is endpoints parsing attacker-controlled JSON, leading to significant CPU and memory usage.
Remediation
Install security update from vendor's website.