CVE-2026-59831

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

Published: Jul 9, 2026Updated: Jul 14, 2026 Sources: CVE List NVDCWE-829

4.4MEDIUM

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.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:HAttack Complexity

High

PR:LPrivileges Required

Low

UI:RUser Interaction

Required

Scope

S:CScope

Changed

Impact

C:LConfidentiality

Low

I:LIntegrity

Low

A:NAvailability

None

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Weaknesses

CWE-829

Affected Products

cli

oss-project

cliOn-prem

OSS Libraries / generic-library

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique

Initial Access

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References

https://github.com/cli/cli/commit/b300f2ec7ec9dc9addc39b2ad88c54097ded7ca0

github.com

https://github.com/cli/cli/releases/tag/v2.96.0

github.com

https://github.com/cli/cli/security/advisories/GHSA-8cg3-r6g9-fpg2

github.com

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