CVE-2026-59831

mediumCVSS 4.4covered by 2 sourcesfirst seen 2026-07-09

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.

CSIRTS triage

product: GitHub CLI Remote code execution

What: A vulnerability in GitHub CLI could allow remote code execution when connecting to a malicious Codespace.
Who is affected: Users of GitHub CLI are affected by this vulnerability.
Urgency: Remediation is medium urgency due to the medium severity of the vulnerability.
Action: Update GitHub CLI to the latest version to mitigate the risk.

AI-assisted analysis generated from the source advisory — verify against the original.

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Exploitation outlook

Low exploitation risk0.33% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 25% of all EPSS-scored CVEs.

Advisory coverage (2)

mediumCVE-2026-59831: GitHub CLI `gh codespace jupyter` could allow remote code execution when connecting to a malic…msrc · 2026-07-14
mediumCVE-2026-59831: GitHub CLI (gh) is GitHub’s official command line tool. From 2.10.0 through 2.95.0, connecting…nvd · 2026-07-09

External references

NVD record for CVE-2026-59831

CVE.org record

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