Description
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.
Published: 2026-10-09
Score: 7.5 High
EPSS: < 1% Very Low
KEV: No
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Remediation

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Tracking

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Advisories

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History

Fri, 09 Oct 2026 18:30:00 +0200

Type Values Removed Values Added
Weaknesses CWE-405
Metrics ssvc

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


Fri, 09 Oct 2026 04:30:00 +0200

Type Values Removed Values Added
Weaknesses CWE-400

Fri, 09 Oct 2026 03:00:00 +0200

Type Values Removed Values Added
First Time appeared Go Standard Library
Go Standard Library crypto Tls
Vendors & Products Go Standard Library
Go Standard Library crypto Tls

Fri, 09 Oct 2026 02:45:00 +0200

Type Values Removed Values Added
Weaknesses CWE-400

Fri, 09 Oct 2026 02:15:00 +0200

Type Values Removed Values Added
Weaknesses CWE-770
References
Metrics threat_severity

None

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'}

threat_severity

Important


Fri, 09 Oct 2026 01:00:00 +0200

Type Values Removed Values Added
Description 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.
Title Reject malformed ECH outer extension references in crypto/tls
References

Subscriptions

Go Standard Library Crypto Tls
cve-icon MITRE

Status: PUBLISHED

Assigner: Go

Published:

Updated: 2026-10-09T15:59:17.238Z

Reserved: 2026-09-23T23:03:36.988Z

Link: CVE-2026-97031

cve-icon Vulnrichment

Updated: 2026-10-09T15:57:58.276Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-08T23:17:06.037

Modified: 2026-10-09T16:35:35.900

Link: CVE-2026-97031

cve-icon Redhat

Severity : Important

Publid Date: 2026-10-08T22:53:58Z

Links: CVE-2026-97031 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-10-09T21:15:12Z

Weaknesses
  • CWE-405

    Asymmetric Resource Consumption (Amplification)

  • CWE-770

    Allocation of Resources Without Limits or Throttling