Bug 2515827 (CVE-2026-56853) - CVE-2026-56853 net/http: golang: Go net/http: Unencrypted HTTP/2 connections vulnerable to Denial of Service
Summary: CVE-2026-56853 net/http: golang: Go net/http: Unencrypted HTTP/2 connections ...
Keywords:
Status: NEW
Alias: CVE-2026-56853
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-08-13 22:21 UTC by OSIDB Bzimport
Modified: 2026-08-26 13:55 UTC (History)
140 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2026:60304 0 None None None 2026-08-26 13:55:37 UTC
Red Hat Product Errata RHSA-2026:60305 0 None None None 2026-08-26 13:54:45 UTC
Red Hat Product Errata RHSA-2026:60306 0 None None None 2026-08-26 13:42:06 UTC

Description OSIDB Bzimport 2026-08-13 22:21:58 UTC 
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.
Comment 11 errata-xmlrpc 2026-08-26 13:42:00 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:60306 https://access.redhat.com/errata/RHSA-2026:60306
Comment 12 errata-xmlrpc 2026-08-26 13:54:36 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:60305 https://access.redhat.com/errata/RHSA-2026:60305
Comment 13 errata-xmlrpc 2026-08-26 13:55:29 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:60304 https://access.redhat.com/errata/RHSA-2026:60304
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