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.
History

Thu, 10 Sep 2026 05:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-400
CWE-417

Wed, 09 Sep 2026 12:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-833
References
Metrics threat_severity

None

threat_severity

Moderate


Fri, 04 Sep 2026 16:45:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:golang:crypto:*:*:*:*:*:go:*:*

Thu, 03 Sep 2026 16:00:00 +0000

Type Values Removed Values Added
First Time appeared Golang
Golang crypto
Vendors & Products Golang
Golang crypto

Thu, 03 Sep 2026 14:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-770
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 03 Sep 2026 10:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-400
CWE-417

Wed, 02 Sep 2026 19:45:00 +0000

Type Values Removed Values Added
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.
Title Prevent DoS on deadlocked undecided channel in golang.org/x/crypto/ssh
References

cve-icon MITRE

Status: PUBLISHED

Assigner: Go

Published: 2026-09-02T19:37:05.741Z

Updated: 2026-09-03T13:20:12.263Z

Reserved: 2026-08-24T23:36:15.738Z

Link: CVE-2026-78662

cve-icon Vulnrichment

Updated: 2026-09-03T13:20:04.912Z

cve-icon NVD

Status : Analyzed

Published: 2026-09-02T20:17:37.167

Modified: 2026-09-04T16:33:34.057

Link: CVE-2026-78662

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-09-02T19:37:05Z

Links: CVE-2026-78662 - Bugzilla