Time-of-check Time-of-use (TOCTOU) Race Condition in Node.js - CVE-2026-48931
Published: June 22, 2026
Vulnerability identifier: #VU135025
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-48931
CWE-ID: CWE-367
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Node.js Foundation
Affected software:
Node.js
Node.js
Detailed vulnerability description
The vulnerability allows a remote attacker to poison the HTTP response queue.
The vulnerability exists due to a time-of-check time-of-use race condition in http.Agent when accepting a response before the client has sent the request. A remote attacker can send a response early to poison the HTTP response queue.
How to mitigate CVE-2026-48931
Install security update from vendor's website.