CVE-2026-59831
MediumCVSS 4.4Exploitation Probability (EPSS)
Low risk10th percentile - higher than 10% of all known CVEs
Summary
A vulnerability in GitHub CLI (gh) from version 2.10.0 through 2.95.0 allows arbitrary command execution when connecting to a malicious Codespace using the `gh codespace jupyter` command. 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.
Risk Assessment
An attacker can exploit this vulnerability to execute arbitrary code on the victim's machine, potentially leading to system compromise, data theft, or further propagation of the attack within the organization's network.
Recommendation
Immediately update GitHub CLI to version 2.96.0 or later, which includes a fix for this vulnerability.
Other vulnerabilities in GitHub CLI
See all- CVE-2026-72924Low
GitHub CLI (gh) versions 2.28.0 through 2.97.0 bind the local listener created by gh codespace ports forward to all available network interfaces by default. While port forwarding is active, a service in a Codespace can become reachable through the user's non-loopback local IP addresses. This issue is fixed in version 2.98.0.
- CVE-2026-64655Low
GitHub CLI before 2.97.0 fails to escape regex metacharacters in --signer-repo and --signer-workflow, allowing attackers to bypass Sigstore attestation verification with lookalike names.
- CVE-2026-64654Medium
GitHub CLI (gh) is GitHub's official command line tool. Prior to version 2.97.0, multiple GitHub CLI commands printed externally controlled gist, API, pull request, release, codespace, skill, or agent-task content without neutralizing terminal escape sequences. An attacker who can influence that content can embed escape sequences that are interpreted by the terminal of a user who runs an affected command, with impact ranging from cosmetic manipulation of the title or on-screen content to, on some terminal emulators, command execution. This issue is fixed in version 2.97.0.
- CVE-2026-64653Medium
GitHub CLI (gh) is GitHub’s official command line tool. Prior to 2.97.0, some HTTP request URLs interpolate variable path components without percent encoding, allowing URL path metacharacters in attacker-controlled repository or resource values to make gh address a different API endpoint or resource than the user intended. This issue is fixed in version 2.97.0.
- CVE-2026-64652Low
GitHub CLI before 2.97.0 masks only part of certain tokens in gh auth status, potentially exposing token fragments in terminal or CI output.
- CVE-2026-48501High
GitHub CLI (gh) prior to version 2.93.0 incorrectly includes authorization headers in API requests to TUF repository mirrors. A host normalization flaw causes user tokens to be sent to external servers like tuf-repo.github.com, posing a security risk.
Original NVD description (English source)
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.