CVE-2026-12856

High

Description

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.

SeverityHigh

CVSS8.8

Exploit probability—

Product

Redhat Openshift Dev Spaces

PublishedJun 29, 2026

First seenJun 29, 2026

Weakness typeCWE-88CWE-88

How to fix

Vendor advisories

access.redhat.com/errata/RHSA-2026:36820

Affected products

Product	Affected versions	Fixed in
redhat openshift_dev_spaces	No range specified	—

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