This page tracks the Debian fix status. The vulnerability itself is described on the main CVE page. View CVE-2026-78663 →

DEBIAN-CVE-2026-78663

The HTTP/2 server can refund connection-level flow control twice for the same data: Once when a client resets a stream (refunding data for any sent-bu...

Original description

The description as published by the source.

The HTTP/2 server can refund connection-level flow control twice for the same data: Once when a client resets a stream (refunding data for any sent-but-unread portion of the stream), and again when a request handler reads the buffered data. A malicious client can exploit this to bypass the configured connection-level flow control limit (MaxReceiveBufferPerConnection). Total buffered data is still limited by the concurrent stream limit and stream-level flow control.

Source: OSV.dev (Open Source Vulnerabilities) OSV

Affected packages

Debian:12 golang-1.19

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Debian:13 golang-1.24

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Debian:14 golang-1.26

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.26.9-1"}]}]

Debian:14 golang-1.27

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.27.2-1"}]}]

Debian:12 golang-golang-x-net

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Debian:13 golang-golang-x-net

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Debian:14 golang-golang-x-net

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:0.60.0-1"}]}]

References

advisory security-tracker.debian.org