CVE-2026-56853

—

CVSS 3.1

7.5 high

EPSS

<1%p45

Published

Aug 13, 2026 (Aug 13, 2026)

Modified

Sep 3, 2026

Description

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.

Weakness: CWE-770
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

NVD CVE.org GitHub PoCs EPSS (0.6%)

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