CVE-2026-59831Network attack vector

Command execution via unvalidated Jupyter server URL

Published Jul 9, 2026 · Updated Jul 9, 2026

Command execution in GitHub CLI 2.10.0 through 2.95.0 allows remote authenticated users to run code via a malicious Codespace. StartJupyterServer trusts a Codespace-supplied JupyterLab URL, which permits a vscode or vscode-insiders scheme to reach the operating system and launch VS Code. Exploitation requires the user to run gh codespace jupyter against the malicious Codespace and accept a VS Code open-URL or Workspace Trust prompt.

CVSS severity4.4
Medium
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Command execution in GitHub CLI 2.10.0 through 2.95.0 allows remote authenticated users to run code via a malicious Codespace. StartJupyterServer trusts a Codespace-supplied JupyterLab URL, which permits a vscode or vscode-insiders scheme to reach the operating system and launch VS Code. Exploitation requires the user to run gh codespace jupyter against the malicious Codespace and accept a VS Code open-URL or Workspace Trust prompt.

The record

CVE
CVE-2026-59831
Published
Jul 9, 2026
Updated
Jul 9, 2026
Vendor
Twitter
Product
GitHub CLI
Classifications
CWE-20, CWE-829, T1204
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 2.10.0, < 2.96.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Twitter · GitHub CLIversion=>= 2.10.0, < 2.96.0

Published CVSS scores

4.4GitHubCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
CWE-829Inclusion of Functionality from Untrusted Control Sphere
T1204User Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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