CVE-2026-6733
Description
Impact: Undici's HTTP/1.1 client is vulnerable to response queue poisoning on reused keep-alive sockets. An attacker-controlled upstream server can inject an unsolicited HTTP/1.1 response onto an idle socket after a request completes. When the client dispatches the next request on that socket, it associates the injected response with the new request, causing responses to be delivered to the wrong requests. This requires an attacker-controlled or compromised upstream HTTP/1.1 server and keep-alive connection reuse. Patches: Upgrade to undici v6.26.0, v7.28.0 or v8.5.0. Workarounds: Disable keep-alive connection reuse by setting keepAliveTimeout: 0 on the Client or Pool.
CVSS Details
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N Threat Intelligence
Weaknesses 1
References 3
- cna.openjsf.org https://cna.openjsf.org/security-advisories.html
- github.com https://github.com/nodejs/undici/security/advisories/GHSA-35p6-xmwp-9g52
- hackerone.com https://hackerone.com/reports/3582376
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.