CVE-2026-12856

HIGH 8.8

Vscode-java: vscode: command injection vulnerability in the javadoc hover provider of the vscode-java extension

CVSS Score

8.8

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-88
Vendor	red hat
Product	red hat openshift dev spaces
Published	Jun 29, 2026
Last Updated	Jun 29, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

Red Hat / Red Hat OpenShift Dev Spaces

All versions affected

References

NVD ↗ CVE.org ↗ EPSS Data ↗

access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-12856 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2491278 github.com: https://github.com/redhat-developer/vscode-java/security/advisories/GHSA-7qv8-6qrw-3crv

Credits

Red Hat would like to thank byte256 for reporting this issue.