CVE-2026-56853

UNKNOWN 0.0

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

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

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.

Vendor	go standard library
Product	net/http
Published	Aug 13, 2026

Stay Ahead of the Next One

Get instant alerts for go standard library net/http

Be the first to know when new unknown vulnerabilities affecting go standard library net/http are published — delivered to Slack, Telegram or Discord.

Get Free Alerts → Free · No credit card · 60 sec setup

Affected Versions

Go standard library / net/http

0 < 1.25.13 1.26.0-0 < 1.26.6 1.27.0-0 < 1.27.0-rc.3

References

NVD ↗ CVE.org ↗ EPSS Data ↗

go.dev: https://go.dev/issue/80205 go.dev: https://go.dev/cl/795540 groups.google.com: https://groups.google.com/g/golang-announce/c/94pEornpRlI pkg.go.dev: https://pkg.go.dev/vuln/GO-2026-6089