HIGH7.5
GO-2026-6610
HTTP/2 transport accepts malformed framing-related headers in net/http
Quick fix
GO-2026-6610 — stdlib: upgrade to the fixed version with the command below.
go get stdlib@v1.26.9Details
Historically, we have been rather lax about malformed framing-related headers in our HTTP/2 implementation, as they cannot interfere with HTTP/2 framing. However, this makes it possible for our HTTP/2 implementation to forward responses containing such headers to an HTTP/1 client when acting as a reverse proxy. If the HTTP/1 client also does not behave strictly enough, this can result in response smuggling.
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