CVE-2026-59831CWE-829

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

Medium · published July 9, 2026

CVSS v3.1
4.4
EPSS
0%
Percentile
24.5
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
4.4 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00326 · 24.5th percentile
Weakness
CWE-829 · Inclusion of Functionality from Untrusted Control Sphere
Published
2026-07-09T22:11Z
EPSS history
Timeline
  • 09 JUL 22:11Z
    GitHub CLI `gh codespace jupyter` could allow remote code execution when connecting to a malicious Codespace
    cvelistv5