—

GO-2026-6089

Apply ReadHeaderTimeout when doing unencrypted HTTP/2 check in net/http

Quick fix

GO-2026-6089 — stdlib: upgrade to the fixed version with the command below.

go get stdlib@v1.25.13

Details

When a server is configured to support unencrypted HTTP/2, it reads a few bytes from each new connection to see if they contain the HTTP/2 client preface. ReadHeaderTimeout is unexpectedly not being applied when doing this.

Are you affected?

Enter the version of the package you're using.

Affected packages

Go / stdlib

Introduced in: 0 Fixed in: 1.25.13

Fix go get stdlib@v1.25.13

References

https://go.dev/issue/80205 [REPORT]
https://go.dev/cl/795540 [FIX]
https://groups.google.com/g/golang-announce/c/94pEornpRlI [WEB]