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TI-2026-42647 Aliases CVE-2026-59831

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

Priority LOW 20CWE-829Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
Required
Attack complexity
High
Impact type
Code execution
Confidentiality · integrity · availability
Low · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-829.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00326 25th percentileScored 2026-11-07
Fix Fixed cli (cli): 2.96.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
clicli2.10.0 to before 2.96.02.96.0Patch availableCNA
  • cli Vendorcli Affected 2.10.0 to before 2.96.0 Fixed in 2.96.0 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:github:cli:*:*:*:*:*:*:*:*——GitHub
  • cpe:2.3:a:github:cli:*:*:*:*:*:*:*:* Versions — — ·GitHub

Remediation

  • Fix · CNA cli (cli) Fixed in 2.96.0

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-59831

References

Other 3

  • TI-2025-18873 `gh attestation verify` returns incorrect exit code during verification if no attestations are present CVSS 3.1MEDIUM 6.3
  • TI-2026-33538 gh: GitHub Actions log output in `gh run view` allows terminal escape sequence injection CVSS 3.1LOW 3.5
  • TI-2024-34983 Connecting to a malicious Codespaces via GH CLI could allow command execution on the user's computer CVSS 3.1CRITICAL 9.6
  • TI-2026-35862 GitHub CLI tokens leak via `gh attestation` commands CVSS 3.1CRITICAL 9.1
  • TI-2024-36052 go-gh `auth.TokenForHost` violates GitHub host security boundary within a codespace CVSS 3.1HIGH 7.5
  • TI-2024-36051 Recursive repository cloning can leak authentication tokens to non-GitHub submodule hosts in the gh cli CVSS 3.1MEDIUM 6.5
See all 13 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences