Input validation error in GitHub CLI - #VU136854
Published: July 3, 2026
Vulnerability identifier: #VU136854
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: N/A
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: GitHub CLI
Affected software:
GitHub CLI
GitHub CLI
Detailed vulnerability description
The vulnerability allows a remote user to execute arbitrary code.
The vulnerability exists due to improper input validation in the gh codespace jupyter command when opening the Jupyter server URL returned by a process inside the Codespace. A remote user can supply a crafted vscode:// URL to execute arbitrary code.
User interaction is required to accept a VS Code open URL or Workspace Trust prompt.
Remediation
Install security update from vendor's website.