CVE-2026-12856

HIGHPre-NVD 8.88.8—
EchelonGraph scoreHIGH confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-06-29. a secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
8.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
8.8
EG Score
8.8(high)
EPSS
21.5%
KEV
Not listed

Published

June 29, 2026

Last Modified

June 30, 2026

Advisory Details (2)

Auto-updated Jun 29, 2026
Patch available. Sources: redhat.
redhat

2491278 – (CVE-2026-12856) CVE-2026-12856 vscode-java: vscode: Command Injection vulnerability in the JavaDoc hover provider of the vscode-java extension

https://bugzilla.redhat.com/show_bug.cgi?id=2491278
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-12856

Vendor Advisories for CVE-2026-12856(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 36× in last 7d / 40× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-07 03:56 UTCEG score recompute
  2. 2026-07-07 03:56 UTCGHSA enrichment
  3. 2026-07-06 16:27 UTCEPSS rescore
  4. 2026-07-06 15:39 UTCEG score recompute
  5. 2026-07-06 15:39 UTCGHSA enrichment
  6. 2026-07-06 03:30 UTCEG score recompute
  7. 2026-07-06 03:30 UTCGHSA enrichment
  8. 2026-07-06 02:23 UTCEPSS rescore
  9. 2026-07-05 15:14 UTCEG score recompute
  10. 2026-07-05 15:14 UTCGHSA enrichment
  11. 2026-07-05 03:06 UTCEG score recompute
  12. 2026-07-05 03:06 UTCGHSA enrichment
  13. 2026-07-05 02:30 UTCEPSS rescore
  14. 2026-07-05 02:30 UTCEPSS rescore
  15. 2026-07-04 14:59 UTCEG score recompute
  16. 2026-07-04 14:58 UTCGHSA enrichment
  17. 2026-07-04 06:31 UTCEPSS rescore
  18. 2026-07-04 02:50 UTCEG score recompute
  19. 2026-07-04 02:50 UTCGHSA enrichment
  20. 2026-07-03 14:40 UTCEG score recompute
  21. 2026-07-03 14:40 UTCGHSA enrichment
  22. 2026-07-03 02:31 UTCEG score recompute
  23. 2026-07-03 02:31 UTCGHSA enrichment
  24. 2026-07-02 14:23 UTCEG score recompute
  25. 2026-07-02 14:23 UTCGHSA enrichment
Show 15 more
  1. 2026-07-02 02:15 UTCEG score recompute
  2. 2026-07-02 02:15 UTCGHSA enrichment
  3. 2026-07-01 15:06 UTCEPSS rescore
  4. 2026-07-01 15:06 UTCEPSS rescore
  5. 2026-07-01 14:06 UTCEG score recompute
  6. 2026-07-01 14:06 UTCGHSA enrichment
  7. 2026-07-01 01:58 UTCEG score recompute
  8. 2026-07-01 01:58 UTCGHSA enrichment
  9. 2026-06-30 23:22 UTCEPSS rescore
  10. 2026-06-30 13:49 UTCEG score recompute
  11. 2026-06-30 13:49 UTCGHSA enrichment
  12. 2026-06-30 01:41 UTCEG score recompute
  13. 2026-06-30 01:41 UTCGHSA enrichment
  14. 2026-06-29 13:33 UTCEG score recompute
  15. 2026-06-29 13:32 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-12856?
CVE-2026-12856 is a high vulnerability published on June 29, 2026. 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…
When was CVE-2026-12856 disclosed?
CVE-2026-12856 was first published in the National Vulnerability Database on June 29, 2026, with the most recent update on June 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-12856 actively exploited?
CVE-2026-12856 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 21.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-12856?
CVE-2026-12856 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-12856?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-12856, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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