Bug 2548336 (CVE-2026-97031) - CVE-2026-97031 crypto/tls: golang: crypto/tls: Denial of Service via multiple ECH outer extension references
Summary: CVE-2026-97031 crypto/tls: golang: crypto/tls: Denial of Service via multiple...
Keywords:
Status: NEW
Alias: CVE-2026-97031
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-10-08 23:01 UTC by OSIDB Bzimport
Modified: 2026-10-23 14:11 UTC (History)
75 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-2026:86093 0 None None None 2026-10-20 20:27:05 UTC
Red Hat Product Errata RHSA-2026:86196 0 None None None 2026-10-20 22:53:55 UTC
Red Hat Product Errata RHSA-2026:86203 0 None None None 2026-10-20 21:57:50 UTC
Red Hat Product Errata RHSA-2026:88188 0 None None None 2026-10-22 11:42:38 UTC
Red Hat Product Errata RHSA-2026:88189 0 None None None 2026-10-22 11:59:53 UTC
Red Hat Product Errata RHSA-2026:88280 0 None None None 2026-10-22 15:06:34 UTC
Red Hat Product Errata RHSA-2026:88316 0 None None None 2026-10-22 15:40:29 UTC
Red Hat Product Errata RHSA-2026:88354 0 None None None 2026-10-22 17:40:03 UTC

Description OSIDB Bzimport 2026-10-08 23:01:22 UTC 
Multiple ECH outer extension references are not permitted under RFC 9849; previously, a client could send a well-crafted packet that could trigger memory exhaustion in the server process by specifying multiple references. We now reject these as malformed and curb the memory amplification vector as a result.
Comment 1 Jon Orris 2026-10-20 20:27:02 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:86093 https://access.redhat.com/errata/RHSA-2026:86093
Comment 2 Jon Orris 2026-10-20 21:57:46 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:86203 https://access.redhat.com/errata/RHSA-2026:86203
Comment 3 Jon Orris 2026-10-20 22:53:50 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:86196 https://access.redhat.com/errata/RHSA-2026:86196
Comment 5 Jon Orris 2026-10-22 11:42:34 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:88188 https://access.redhat.com/errata/RHSA-2026:88188
Comment 6 Jon Orris 2026-10-22 11:59:48 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:88189 https://access.redhat.com/errata/RHSA-2026:88189
Comment 7 Jon Orris 2026-10-22 15:06:29 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:88280 https://access.redhat.com/errata/RHSA-2026:88280
Comment 8 Jon Orris 2026-10-22 15:40:25 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:88316 https://access.redhat.com/errata/RHSA-2026:88316
Comment 9 Jon Orris 2026-10-22 17:39:59 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:88354 https://access.redhat.com/errata/RHSA-2026:88354
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