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

EPSS Score

0.38% (percentile: 31.0%)

Affected Products (12)

Other

• 21648-17084
• 21666-17084
• 21688-17084
• 21768-17084
• 21743-17084
• 21682-17084
• 21668-17084
• 21652-17084
• 17793-17084
• 21691-17084
• 21800-17084
• 21693-17084

Security Updates (1)

• Security Update

Revision History

• 2026-09-07: Information published.