CVE-2026-78662

Prevent DoS on deadlocked undecided channel in golang.org/x/crypto/ssh

Published Sep 2, 2026 CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

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History
Type Values Removed Values Added
Weaknesses CWE-400
CWE-417
Type Values Removed Values Added
CPEs cpe:2.3:a:golang:crypto:*:*:*:*:*:go:*:*
Type Values Removed Values Added
First Time appeared Golang
Golang crypto
Vendors & Products Golang
Golang crypto
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'}

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

Sources

Status
PUBLISHED
Assigner
Go
Published
Updated
Sep 3, 2026, 1:20 PM
Reserved
Aug 24, 2026, 11:36 PM
Status
Analyzed
Published
Sep 2, 2026, 8:17 PM
Modified
Sep 4, 2026, 4:33 PM
Severity
Moderate
Public date
Sep 2, 2026, 7:37 PM