GO-2026-6611

vendorUSosv

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

view advisory published 2026-10-08Licence: per source

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.

describes (1)

Related CVEs.

ID	severity	EPSS	exploitable	published
CVE-2026-78669US	—	0.61% (49th)	—	2026-10-08
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 SETT…

references

External citations — patches, advisories, analysis.

https://go.dev/cl/847186FIX
https://go.dev/cl/847308FIX
https://go.dev/issue/81742REPORT
https://groups.google.com/g/golang-announce/c/U2fTuyDJznIWEB
https://groups.google.com/g/golang-announce/c/ZPwCyRUuGBsWEB

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