CVE-2026-59831

Summary: CVE-2026-59831 affects GitHub CLI (gh) prior to 2.96.0. When using the command gh codespace jupyter, a malicious Codespace could supply a JupyterLab URL to the process inside the Codespace without validating that it is a loopback address, enabling a crafted vscode:// or vscode-insiders:/...

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

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 loopbac...

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