GHSA-35p6-xmwp-9g52
undici vulnerable to HTTP response queue poisoning via keep-alive socket reuse
Quick fix
GHSA-35p6-xmwp-9g52 — undici: upgrade to the fixed version with the command below.
npm install undici@6.27.0Details
## 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 v6.27.0, v7.28.0 or v8.5.0.
## Workarounds
Disable keep-alive connection reuse by setting `keepAliveTimeout: 0` on the Client or Pool.
Are you affected?
Enter the version of the package you're using.
Affected packages
References
- https://github.com/nodejs/undici/security/advisories/GHSA-35p6-xmwp-9g52 [WEB]
- https://nvd.nist.gov/vuln/detail/CVE-2026-6733 [ADVISORY]
- https://github.com/nodejs/undici/commit/6ea54ef8c4051e95bb68c89d4a5c9274fe6fbb4b [WEB]
- https://hackerone.com/reports/3582376 [WEB]
- https://cna.openjsf.org/security-advisories.html [WEB]
- https://github.com/nodejs/undici [PACKAGE]
- https://github.com/nodejs/undici/releases/tag/v6.27.0 [WEB]
- https://github.com/nodejs/undici/releases/tag/v7.28.0 [WEB]
- https://github.com/nodejs/undici/releases/tag/v8.5.0 [WEB]