Red Hat OpenShift Dev Spaces vscode-java Extension argument injection

Summaryinfo

A vulnerability described as critical has been identified in Red Hat OpenShift Dev Spaces. This affects an unknown function of the component vscode-java Extension. Such manipulation leads to argument injection. This vulnerability is traded as CVE-2026-12856. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in Red Hat OpenShift Dev Spaces (unknown version). It has been rated as critical. Affected by this issue is an unknown code block of the component vscode-java Extension. The manipulation with an unknown input leads to a argument injection vulnerability. Using CWE to declare the problem leads to CWE-88. The product constructs a string for a command to be executed by a separate component in another control sphere, but it does not properly delimit the intended arguments, options, or switches within that command string. Impacted is confidentiality, integrity, and availability. CVE summarizes:

A flaw was found in the vscode-java extension, which provides Java language support for Visual Studio Code. The extension incorrectly trusts all Markdown content in JavaDoc hovers, allowing a malicious Java file to include hidden commands. If a user clicks a specially crafted link within a JavaDoc hover popup, an attacker can execute arbitrary VS Code commands, which can lead to full system compromise in trusted workspaces.

The advisory is shared for download at access.redhat.com. This vulnerability is handled as CVE-2026-12856 since 06/22/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 06/29/2026). The MITRE ATT&CK project declares the attack technique as T1059.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• Virtualization Software

Vendor

• Red Hat

Name

• OpenShift Dev Spaces

License

• open-source

Website

• Vendor: https://www.redhat.com/

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