Riskcovery

CVE-2026-78669

Excessive CPU consumption from repeated initial window changes in net/http

State
Published
Severity
7.5 High
Published
Oct 8, 2026
Updated
Oct 9, 2026
Reserved
Aug 24, 2026

Read the record on cve.org

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.

Scores

CVSSScoreVectorSource
3.17.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HCISA-ADP

Weaknesses

  • CWE-405 Asymmetric Resource Consumption (Amplification)

Affected Products

ProductVersions
net/httpGo standard library
  • before 1.26.9Affected
net/http/internal/http2Go standard library
  • 1.27.0-0 to before 1.27.2Affected
golang.org/x/net/http2golang.org/x/net
  • before 0.60.0Affected

References

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