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.
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Fixes

Solution

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Workaround

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History

Sat, 15 Aug 2026 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Important


Fri, 14 Aug 2026 16:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-770
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 13 Aug 2026 23:45:00 +0000

Type Values Removed Values Added
First Time appeared Go Standard Library
Go Standard Library net/http
Vendors & Products Go Standard Library
Go Standard Library net/http

Thu, 13 Aug 2026 22:15:00 +0000

Type Values Removed Values Added
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.
Title Apply ReadHeaderTimeout when doing unencrypted HTTP/2 check in net/http
References

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cve-icon MITRE

Status: PUBLISHED

Assigner: Go

Published:

Updated: 2026-08-14T15:23:18.680Z

Reserved: 2026-06-23T15:10:49.352Z

Link: CVE-2026-56853

cve-icon Vulnrichment

Updated: 2026-08-14T15:23:09.733Z

cve-icon NVD

Status : Received

Published: 2026-08-13T22:17:22.093

Modified: 2026-08-14T16:16:57.210

Link: CVE-2026-56853

cve-icon Redhat

Severity : Important

Publid Date: 2026-08-13T21:58:53Z

Links: CVE-2026-56853 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-08-14T17:45:03Z

Weaknesses