Description
A malicious HTTP/2 peer can cause excessive CPU consumption in the client or server by opening a large number of streams and then sending many small SETTINGS frames containing SETTINGS_INITIAL_WINDOW_SIZE values.
Published: 2026-10-08
Score: 7.5 High
EPSS: < 1% Very Low
KEV: No
AI Analysis

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Remediation

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Tracking

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Advisories

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History

Fri, 09 Oct 2026 17:30:00 +0000

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 12:15:00 +0000

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 09:15:00 +0000

Type Values Removed Values Added
First Time appeared Go Standard Library
Go Standard Library net/http
Go Standard Library net/http2
Vendors & Products Go Standard Library
Go Standard Library net/http
Go Standard Library net/http2

Thu, 08 Oct 2026 23:00:00 +0000

Type Values Removed Values Added
Description A malicious HTTP/2 peer can cause excessive CPU consumption in the client or server by opening a large number of streams and then sending many small SETTINGS frames containing SETTINGS_INITIAL_WINDOW_SIZE values.
Title Excessive CPU consumption from repeated initial window changes in net/http
References

Subscriptions

Go Standard Library Net/http Net/http2
cve-icon MITRE

Status: PUBLISHED

Assigner: Go

Published:

Updated: 2026-10-09T16:32:57.198Z

Reserved: 2026-08-24T23:36:15.739Z

Link: CVE-2026-78669

cve-icon Vulnrichment

Updated: 2026-10-09T16:31:11.090Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-08T23:17:04.010

Modified: 2026-10-09T17:16:49.857

Link: CVE-2026-78669

cve-icon Redhat

Severity : Important

Publid Date: 2026-10-08T22:53:59Z

Links: CVE-2026-78669 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-10-09T14:15:09Z

Weaknesses