CVE-2026-39830: Invoking client can cause server deadlock on unexpected responses in golang.org/x/crypto/ssh

Overview

Severity

Critical (CVSS 9.1)

CVSS Vector

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

Exploit Status

Not Exploited

Patch Tuesday

2026-May

Released

2026-05-27

Last Updated

2026-06-03

EPSS Score

0.53% (percentile: 41.2%)

Affected Products (14)

Other

• 20984-17084
• 20985-17084
• 21271-17084
• 21272-17084
• 21278-17084
• 21256-17084
• 21299-17084
• 17793-17084
• 21274-17084
• 20433-17084
• 20966-17084
• 21378-17084
• 21418-17084

Open Source Software

• azl3 telegraf 1.31.0-19 on Azure Linux 3.0

Revision History

• 2026-05-27: Information published.
• 2026-05-28: Information published.
• 2026-05-30: Information published.
• 2026-05-31: Information published.
• 2026-06-02: Information published.
• 2026-06-03: Information published.