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Vulnerability Report: GO-2026-6089

standard library

CVE-2026-56853
Affects: net/http
Published: Aug 13, 2026

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.

Affected Packages

Path

Go Versions

Symbols
net/http

before go1.25.13, from go1.26.0-0 before go1.26.6, from go1.27.0-0 before go1.27.0-rc.3
8 affected symbols

?	: This menu
/	: Search site
f or F	: Jump to
y or Y	: Canonical URL

Vulnerability Report: GO-2026-6089

Affected Packages

Aliases

References

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