CVE-2026-12856

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.

CVSS 3.1

8.8CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS

0.5% chance of exploitation in the next 30 days; higher than 45% of CVEs (scores of 2026-10-25)

CWE

CWE-88

Published

2026-06-29

Modified

2026-10-25

Record from

the NVD, synced 2026-10-25

Affected

• redhat:openshift_dev_spaces

References

• https://access.redhat.com/errata/RHSA-2026:36820
• https://access.redhat.com/security/cve/CVE-2026-12856
• https://bugzilla.redhat.com/show_bug.cgi?id=2491278
• https://github.com/redhat-developer/vscode-java/security/advisories/GHSA-7qv8-6qrw-3crv
• https://access.redhat.com/errata/RHSA-2026:36820

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