Cyber Resilience

CVE-2026-12856

High

Published: 29 June 2026

Published
29 June 2026
Modified
30 June 2026
KEV Added
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Patch
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CVSS Score v3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS Score 0.0030 21.4th percentile
Risk Priority 55 floored blend · peak EPSS

Summary

CVE-2026-12856 is a high-severity Argument Injection (CWE-88) vulnerability in Redhat (inferred from references). Its CVSS base score is 8.8 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Command and Scripting Interpreter (T1059); ranked at the 21.4th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

OWASP Top 10 for Web (2025)

A05:2025 Injection

EU & UK References

Vulnerability details

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…

more

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(s)
CWE-88

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1059 Command and Scripting Interpreter Execution
Adversaries may abuse command and script interpreters to execute commands, scripts, or binaries.
attack.mitre.org →
Why these techniques?

Arbitrary VS Code command execution via crafted Markdown hover directly enables subsequent use of command/script interpreters for system compromise.

Confidence: MEDIUM · MITRE ATT&CK Enterprise v19.0

CVEs Like This One

CVE-2026-3515Shared CWE-88
CVE-2026-22583Shared CWE-88
CVE-2026-42284Shared CWE-88
CVE-2026-44450Shared CWE-88
CVE-2026-53694Shared CWE-88
CVE-2026-41013Shared CWE-88
CVE-2026-44790Shared CWE-88
CVE-2025-21613Shared CWE-88
CVE-2025-3945Shared CWE-88
CVE-2022-31749Shared CWE-88

Affected Assets

Redhat
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inferred from references and description; NVD did not file a CPE for this CVE

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References