CVE-2026-59831: GitHub CLI `gh codespace jupyter` could allow remote code execution when connecting to a malicious Codespace

Overview

Severity

Medium (CVSS 4.4)

CVSS Vector

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

Exploit Status

Not Exploited

Patch Tuesday

2026-Jul

Released

2026-07-15

Last Updated

2026-08-13

EPSS Score

0.33% (percentile: 25.1%)

Affected Products (2)

Other

• 21555-17084
• 21668-17084

Revision History

• 2026-07-15: Information published.
• 2026-07-16: Information published.
• 2026-08-13: Information published.