CVE-2026-78669CWE-405

CVE-2026-78669

High · published October 9, 2026

CVSS v3.1
7.5
EPSS
1%
Percentile
46.3
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00568 · 46.3th percentile
Weakness
CWE-405 · Asymmetric Resource Consumption (Amplification)
Published
2026-10-09T03:17Z
References (6)
https://go.dev/cl/847186 · [email protected]https://go.dev/cl/847308 · [email protected]https://go.dev/issue/81742 · [email protected]https://groups.google.com/g/golang-announce/c/U2fTuyDJznI · [email protected]https://groups.google.com/g/golang-announce/c/ZPwCyRUuGBs · [email protected]https://pkg.go.dev/vuln/GO-2026-6611 · [email protected]
EPSS history
Timeline
  • 10 OCT 03:31Z
    EPSS moved — → 0%
    epss
  • 08 OCT 22:53Z
    Excessive CPU consumption from repeated initial window changes in net/http
    cvelistv5
  • 08 OCT 22:53Z
    Excessive CPU consumption from repeated initial window changes in net/http
    cvelistv5