CVE-2026-12856: Red Hat Openshift Dev Spaces

High severity, CVSS 8.8. EPSS: 0.5% chance of exploitation in the next 30 days.

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.

Affected products

• Red Hat Openshift Dev Spaces: affected versions not specified

Published 2026-06-29. Last modified 2026-07-15.