This page tracks the Debian fix status. The vulnerability itself is described on the main CVE page. View CVE-2026-56853 →

DEBIAN-CVE-2026-56853

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 pref...

Original description

The description as published by the source.

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.

Source: OSV.dev (Open Source Vulnerabilities) OSV

Affected packages

Debian:12 golang-1.19

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Debian:13 golang-1.24

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Debian:14 golang-1.26

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.26.6-1"}]}]

Debian:14 golang-1.27

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.27~rc3-1"}]}]

References

advisory security-tracker.debian.org