CVE-2026-78669

UNKNOWN 0.0

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

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

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.

Vendor	go standard library
Product	net/http
Published	Oct 8, 2026

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Affected Versions

Go standard library / net/http

0 < 1.26.9

Go standard library / net/http/internal/http2

1.27.0-0 < 1.27.2

golang.org/x/net / golang.org/x/net/http2

0 < 0.60.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

go.dev: https://go.dev/cl/847186 go.dev: https://go.dev/cl/847308 go.dev: https://go.dev/issue/81742 groups.google.com: https://groups.google.com/g/golang-announce/c/U2fTuyDJznI groups.google.com: https://groups.google.com/g/golang-announce/c/ZPwCyRUuGBs pkg.go.dev: https://pkg.go.dev/vuln/GO-2026-6611

Credits

Jakub Ciolek (https://ciolek.dev)