CVE-2026-78669

Name	CVE-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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
golang-1.19 (PTS)	bookworm	1.19.8-2	vulnerable
golang-1.24 (PTS)	trixie	1.24.4-1	vulnerable
golang-1.26 (PTS)	forky, sid	1.26.10-1	fixed
golang-1.27 (PTS)	forky, sid	1.27.3-1	fixed
golang-golang-x-net (PTS)	bookworm	1:0.7.0+dfsg-1	vulnerable
	trixie	1:0.27.0-2	vulnerable
	forky, sid	1:0.61.0-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version
golang-1.19	source	(unstable)	(unfixed)
golang-1.24	source	(unstable)	(unfixed)
golang-1.25	source	(unstable)	(unfixed)
golang-1.26	source	(unstable)	1.26.9-1
golang-1.27	source	(unstable)	1.27.2-1
golang-golang-x-net	source	(unstable)	1:0.60.0-1

Notes

[trixie] - golang-1.24 <no-dsa> (Minor issue)
[bookworm] - golang-1.19 <postponed> (Minor issue)
[trixie] - golang-golang-x-net <no-dsa> (Minor issue)
[bookworm] - golang-golang-x-net <postponed> (Minor issue)
https://www.openwall.com/lists/oss-security/2026/10/08/9
https://github.com/golang/go/issues/81742
Fixed by: https://github.com/golang/go/commit/1d58cdaa1069e259b60c324ec77472f09f23d92e (go1.27.2)
Fixed by: https://github.com/golang/go/commit/6e049521882c944afc1e519a83971ec421dc2974 (go1.26.9)
Fixed by: https://github.com/golang/net/commit/cc7d34fd2dd5864bcafe3e5e0a84919240be98c0 (v0.60.0)