Medium 4.4Published Jul 9, 2026

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

Updated under an hour ago (Oct 27, 2026, 4:23 AM ET)

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Exploited in the last 30 days

GitHub CLI (gh) is GitHub’s official command line tool. From 2.10.0 through 2.95.0, connecting to a malicious Codespace with gh codespace jupyter can allow command execution because the command opens a JupyterLab URL supplied by a process inside the Codespace without validating that it is a loopback HTTP or HTTPS address, allowing a crafted vscode:// or vscode-insiders:// URL to be handed to VS Code. This issue is fixed in version 2.96.0.

CVSS: 4.4 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N
Weakness (CWE): CWE-829
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Awaiting Analysis
Record last updated: Jul 13, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

cli cli cli:cli (from the name)	from 2.10.0, < 2.96.0	CNA record

References

References

https://github.com/cli/cli/security/advisories/GHSA-8cg3-r6g9-fpg2	x-refsource-confirm
https://github.com/cli/cli/commit/b300f2ec7ec9dc9addc39b2ad88c54097ded7ca0	x-refsource-misc
https://github.com/cli/cli/releases/tag/v2.96.0	x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.