CVE-2026-56855: Prevent DoS on deadlocked established channel in golang.org/x/crypto/ssh

Overview

Severity

High (CVSS 7.5)

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U

Exploit Status

Not Exploited

Patch Tuesday

2026-Sep

Released

2026-09-07

Last Updated

2026-10-22

EPSS Score

0.50% (percentile: 41.9%)

Affected Products (23)

Other

• 21648-17084
• 21666-17084
• 21907-17084
• 21910-17084
• 21911-17084
• 21893-17084
• 21902-17084
• 21688-17084
• 21768-17084
• 21743-17084
• 21682-17084
• 21668-17084
• 21652-17084
• 21691-17084
• 21693-17084
• 21826-17084
• 21825-17084
• 21832-17084
• 21835-17084
• 21807-17084
• 21814-17084
• 21836-17084
• 21894-17084

Security Updates (1)

• Security Update

Revision History

• 2026-09-07: Information published.
• 2026-09-09: Information published.
• 2026-09-09: Information published.
• 2026-09-11: Information published.
• 2026-09-18: Information published.
• 2026-09-19: Information published.
• 2026-09-23: Information published.
• 2026-09-25: Information published.
• 2026-10-02: Information published.
• 2026-10-07: Information published.
• 2026-10-10: Information published.
• 2026-10-22: Information published.