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GHSA-35p6-xmwp-9g52

undici vulnerable to HTTP response queue poisoning via keep-alive socket reuse

Source: GitHub Advisory Database (reviewed) Low CVE-2026-6733

Packages

EcosystemPackageAffectedFixed in
npm undici < 6.27.0 6.27.0
npm undici >= 7.0.0, < 7.28.0 7.28.0
npm undici >= 8.0.0, < 8.5.0 8.5.0

Details

As written in the advisory (Markdown source, shown as plain text).

## 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.

References

External links from the advisory. They lead to third-party sites.