GO-2026-6611
Excessive CPU consumption from repeated initial window changes in net/http
At a glance
- Published
- Updated
- CVE
- CVE-2026-78669
- Aliases
- BIT-golang-2026-78669
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.
Affected packages
| Package | Versions |
|---|---|
| Go · stdlib | introduced 0, fixed 1.26.9 |
| Go · stdlib | introduced 1.27.0-0, fixed 1.27.2 |
| Go · golang.org/x/net | introduced 0, fixed 0.60.0 |
References
- https://go.dev/cl/847186 FIX
- https://go.dev/cl/847308 FIX
- https://go.dev/issue/81742 REPORT
- https://groups.google.com/g/golang-announce/c/U2fTuyDJznI WEB
- https://groups.google.com/g/golang-announce/c/ZPwCyRUuGBs WEB
Sources
| Source | Licence |
|---|---|
| OSV.dev | CC-BY 4.0 — Go Vulnerability Database |