CVE-2026-78662

Description

Previously, a channel registered in the mux's chanList is not usable until it is established. A malicious peer was able flood the channel's incomingRequests, deadlocking the entire connection. Now, we add an atomic established state, set when a channel becomes usable. Until such a time, handlePacket drops every packet other than the open confirmation/failure, without blocking and without tearing down the connection.

CVSS Vector

References

• https://go.dev/cl/826504
• https://go.dev/issue/81316
• https://groups.google.com/g/golang-announce/c/1y3fb2np35U
• https://pkg.go.dev/vuln/GO-2026-6354