high8.8
CVE-2026-12856
A flaw was found in the vscode-java extension, which provides Java language support for Visual Studio Code.
Impact
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
| Vendor | Product | Affected versions |
|---|---|---|
| Redhat | Openshift Dev Spaces | All versions |
Weakness classification
References
- NVD record
- CVE.org record
- 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://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-12856.json