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Vulnerability record · CVE-2026-12856 · published 29 June 2026

CVE-2026-12856: Redhat openshift dev spaces argument injection vulnerability

Redhat · Openshift Dev Spaces

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.

8.8 CVSS 3.1 High EPSS 0.55% · top 56.3% CWE-88 · Argument injection
8.8CVSS 3.1 base score
0.55%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
15 Jul 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://access.redhat.com/errata/RHSA-2026:36820
https://access.redhat.com/security/cve/CVE-2026-12856 MitigationVendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2491278 Issue TrackingVendor Advisory
https://github.com/redhat-developer/vscode-java/security/advisories/GHSA-7qv8-6qrw-3crv Broken Link
https://access.redhat.com/errata/RHSA-2026:36820
https://access.redhat.com/security/cve/CVE-2026-12856 MitigationVendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2491278 Issue TrackingVendor Advisory
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-12856.json Vendor Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-12856), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.