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

A fix is available — apply it.

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
21.4%
KEV
Not listed

Published

June 29, 2026

Last Modified

July 15, 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(2)

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

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatdevspaces/pluginregistry-rhel9:17829893672026-07-08redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 77× 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. 2026-07-22 14:08 UTCEPSS rescore
  2. 2026-07-21 15:24 UTCEPSS rescore
  3. 2026-07-20 17:08 UTCEPSS rescore
  4. 2026-07-19 14:30 UTCEPSS rescore
  5. 2026-07-19 02:28 UTCEPSS rescore
  6. 2026-07-18 10:04 UTCEPSS rescore
  7. 2026-07-16 19:52 UTCVendor advisory
  8. 2026-07-16 19:52 UTCGHSA enrichment
  9. 2026-07-16 17:02 UTCEPSS rescore
  10. 2026-07-16 06:55 UTCVendor advisory
  11. 2026-07-16 06:55 UTCGHSA enrichment
  12. 2026-07-15 18:46 UTCVendor advisory
  13. 2026-07-15 18:46 UTCGHSA enrichment
  14. 2026-07-15 16:57 UTCEPSS rescore
  15. 2026-07-15 06:27 UTCVendor advisory
  16. 2026-07-15 06:27 UTCGHSA enrichment
  17. 2026-07-15 02:00 UTCEPSS rescore
  18. 2026-07-14 18:16 UTCVendor advisory
  19. 2026-07-14 18:16 UTCGHSA enrichment
  20. 2026-07-14 06:08 UTCVendor advisory
  21. 2026-07-14 06:08 UTCGHSA enrichment
  22. 2026-07-13 22:30 UTCEPSS rescore
  23. 2026-07-13 17:57 UTCVendor advisory
  24. 2026-07-13 17:57 UTCGHSA enrichment
  25. 2026-07-13 06:12 UTCEPSS rescore
Show 52 more
  1. 2026-07-13 05:49 UTCVendor advisory
  2. 2026-07-13 05:49 UTCGHSA enrichment
  3. 2026-07-12 17:41 UTCVendor advisory
  4. 2026-07-12 17:41 UTCGHSA enrichment
  5. 2026-07-12 05:46 UTCEPSS rescore
  6. 2026-07-12 05:33 UTCVendor advisory
  7. 2026-07-12 05:33 UTCGHSA enrichment
  8. 2026-07-11 17:25 UTCVendor advisory
  9. 2026-07-11 17:25 UTCGHSA enrichment
  10. 2026-07-11 08:27 UTCEPSS rescore
  11. 2026-07-11 05:17 UTCVendor advisory
  12. 2026-07-11 05:17 UTCGHSA enrichment
  13. 2026-07-10 17:09 UTCVendor advisory
  14. 2026-07-10 17:09 UTCGHSA enrichment
  15. 2026-07-10 05:01 UTCVendor advisory
  16. 2026-07-10 05:00 UTCGHSA enrichment
  17. 2026-07-09 19:10 UTCEPSS rescore
  18. 2026-07-09 16:46 UTCVendor advisory
  19. 2026-07-09 16:46 UTCGHSA enrichment
  20. 2026-07-09 04:38 UTCVendor advisory
  21. 2026-07-09 04:38 UTCGHSA enrichment
  22. 2026-07-08 16:30 UTCGHSA enrichment
  23. 2026-07-08 15:15 UTCEPSS rescore
  24. 2026-07-08 15:15 UTCEPSS rescore
  25. 2026-07-08 04:22 UTCGHSA enrichment
  26. 2026-07-07 16:07 UTCGHSA enrichment
  27. 2026-07-07 13:46 UTCEPSS rescore
  28. 2026-07-07 03:56 UTCGHSA enrichment
  29. 2026-07-06 16:27 UTCEPSS rescore
  30. 2026-07-06 15:39 UTCGHSA enrichment
  31. 2026-07-06 03:30 UTCGHSA enrichment
  32. 2026-07-06 02:23 UTCEPSS rescore
  33. 2026-07-05 15:14 UTCGHSA enrichment
  34. 2026-07-05 03:06 UTCGHSA enrichment
  35. 2026-07-05 02:30 UTCEPSS rescore
  36. 2026-07-05 02:30 UTCEPSS rescore
  37. 2026-07-04 14:58 UTCGHSA enrichment
  38. 2026-07-04 06:31 UTCEPSS rescore
  39. 2026-07-04 02:50 UTCGHSA enrichment
  40. 2026-07-03 14:40 UTCGHSA enrichment
  41. 2026-07-03 02:31 UTCGHSA enrichment
  42. 2026-07-02 14:23 UTCGHSA enrichment
  43. 2026-07-02 02:15 UTCGHSA enrichment
  44. 2026-07-01 15:06 UTCEPSS rescore
  45. 2026-07-01 15:06 UTCEPSS rescore
  46. 2026-07-01 14:06 UTCGHSA enrichment
  47. 2026-07-01 01:58 UTCGHSA enrichment
  48. 2026-06-30 23:22 UTCEPSS rescore
  49. 2026-06-30 13:49 UTCGHSA enrichment
  50. 2026-06-30 01:41 UTCGHSA enrichment
  51. 2026-06-29 13:33 UTCEG score recompute
  52. 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 July 15, 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 21.4% 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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