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

CVE-2026-59831 is fixed in 2 products on 2 platforms, first by GitHub CLI 2.96.0, released July 2, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-59831
- Priority: Routine
- CVSS: 4.4 (Moderate)
- EPSS: 0.0033
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 9, 2026
- Weakness: Inclusion of Functionality from Untrusted Control Sphere
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-59831

## Description

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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Windows apps | GitHub CLI | 2.96.0 | [GitHub CLI 2.96.0](https://patchblox.com/security/data/fix/windows-app/github.cli-2.96.0.md) | Jul 2, 2026 |
| Linux | gh opensuse-leap 16.0 | 2.102.0-bp160.1.1 | [OPENSUSE-SU-2026:22134-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-22134-1.md) | Nov 7, 2026 |

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Data as of 2026-11-08T19:12:23Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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