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

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Summary

CVECVE-2026-59831
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-09 23:17:05 UTC
Updated2026-07-10 19:17:58 UTC
DescriptionGitHub 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.

Risk And Classification

Primary CVSS: v3.1 4.4 MEDIUM from [email protected]

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

EPSS: 0.001980000 probability, percentile 0.098070000 (date 2026-07-11)

Problem Types: CWE-829 | CWE-829 CWE-829: Inclusion of Functionality from Untrusted Control Sphere

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.4MEDIUMCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N
3.1CNADECLARED4.4MEDIUMCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Cli Cli affected >= 2.10.0, < 2.96.0 Not specified

References

ReferenceSourceLinkTags
github.com/cli/cli/releases/tag/v2.96.0 [email protected] github.com
github.com/cli/cli/security/advisories/GHSA-8cg3-r6g9-fpg2 [email protected] github.com
github.com/cli/cli/commit/b300f2ec7ec9dc9addc39b2ad88c54097ded7ca0 [email protected] github.com
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