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 — 4 sources updated this week
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.8Exploit: None knownExposed: 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)
EG Risk
40(Track)
EG Risk 40/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity88% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
21%
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 15× in last 7d / 89× 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. 2026-07-27 02:33 UTCEG score recompute
  2. 2026-07-27 02:33 UTCVendor advisory
  3. 2026-07-27 02:33 UTCGHSA enrichment
  4. 2026-07-26 14:54 UTCEPSS rescore
  5. 2026-07-26 14:54 UTCEPSS rescore
  6. 2026-07-26 14:18 UTCEG score recompute
  7. 2026-07-26 14:18 UTCVendor advisory
  8. 2026-07-26 14:18 UTCGHSA enrichment
  9. 2026-07-25 14:17 UTCEPSS rescore
  10. 2026-07-24 14:17 UTCEPSS rescore
  11. 2026-07-23 14:18 UTCEPSS rescore
  12. 2026-07-23 03:05 UTCEG score recompute
  13. 2026-07-22 14:08 UTCEPSS rescore
  14. 2026-07-21 15:24 UTCEPSS rescore
  15. 2026-07-20 17:08 UTCEPSS rescore
  16. 2026-07-19 14:30 UTCEPSS rescore
  17. 2026-07-19 02:28 UTCEPSS rescore
  18. 2026-07-18 10:04 UTCEPSS rescore
  19. 2026-07-16 19:52 UTCVendor advisory
  20. 2026-07-16 19:52 UTCGHSA enrichment
  21. 2026-07-16 17:02 UTCEPSS rescore
  22. 2026-07-16 06:55 UTCVendor advisory
  23. 2026-07-16 06:55 UTCGHSA enrichment
  24. 2026-07-15 18:46 UTCVendor advisory
  25. 2026-07-15 18:46 UTCGHSA enrichment
Show 64 more
  1. 2026-07-15 16:57 UTCEPSS rescore
  2. 2026-07-15 06:27 UTCVendor advisory
  3. 2026-07-15 06:27 UTCGHSA enrichment
  4. 2026-07-15 02:00 UTCEPSS rescore
  5. 2026-07-14 18:16 UTCVendor advisory
  6. 2026-07-14 18:16 UTCGHSA enrichment
  7. 2026-07-14 06:08 UTCVendor advisory
  8. 2026-07-14 06:08 UTCGHSA enrichment
  9. 2026-07-13 22:30 UTCEPSS rescore
  10. 2026-07-13 17:57 UTCVendor advisory
  11. 2026-07-13 17:57 UTCGHSA enrichment
  12. 2026-07-13 06:12 UTCEPSS rescore
  13. 2026-07-13 05:49 UTCVendor advisory
  14. 2026-07-13 05:49 UTCGHSA enrichment
  15. 2026-07-12 17:41 UTCVendor advisory
  16. 2026-07-12 17:41 UTCGHSA enrichment
  17. 2026-07-12 05:46 UTCEPSS rescore
  18. 2026-07-12 05:33 UTCVendor advisory
  19. 2026-07-12 05:33 UTCGHSA enrichment
  20. 2026-07-11 17:25 UTCVendor advisory
  21. 2026-07-11 17:25 UTCGHSA enrichment
  22. 2026-07-11 08:27 UTCEPSS rescore
  23. 2026-07-11 05:17 UTCVendor advisory
  24. 2026-07-11 05:17 UTCGHSA enrichment
  25. 2026-07-10 17:09 UTCVendor advisory
  26. 2026-07-10 17:09 UTCGHSA enrichment
  27. 2026-07-10 05:01 UTCVendor advisory
  28. 2026-07-10 05:00 UTCGHSA enrichment
  29. 2026-07-09 19:10 UTCEPSS rescore
  30. 2026-07-09 16:46 UTCVendor advisory
  31. 2026-07-09 16:46 UTCGHSA enrichment
  32. 2026-07-09 04:38 UTCVendor advisory
  33. 2026-07-09 04:38 UTCGHSA enrichment
  34. 2026-07-08 16:30 UTCGHSA enrichment
  35. 2026-07-08 15:15 UTCEPSS rescore
  36. 2026-07-08 15:15 UTCEPSS rescore
  37. 2026-07-08 04:22 UTCGHSA enrichment
  38. 2026-07-07 16:07 UTCGHSA enrichment
  39. 2026-07-07 13:46 UTCEPSS rescore
  40. 2026-07-07 03:56 UTCGHSA enrichment
  41. 2026-07-06 16:27 UTCEPSS rescore
  42. 2026-07-06 15:39 UTCGHSA enrichment
  43. 2026-07-06 03:30 UTCGHSA enrichment
  44. 2026-07-06 02:23 UTCEPSS rescore
  45. 2026-07-05 15:14 UTCGHSA enrichment
  46. 2026-07-05 03:06 UTCGHSA enrichment
  47. 2026-07-05 02:30 UTCEPSS rescore
  48. 2026-07-05 02:30 UTCEPSS rescore
  49. 2026-07-04 14:58 UTCGHSA enrichment
  50. 2026-07-04 06:31 UTCEPSS rescore
  51. 2026-07-04 02:50 UTCGHSA enrichment
  52. 2026-07-03 14:40 UTCGHSA enrichment
  53. 2026-07-03 02:31 UTCGHSA enrichment
  54. 2026-07-02 14:23 UTCGHSA enrichment
  55. 2026-07-02 02:15 UTCGHSA enrichment
  56. 2026-07-01 15:06 UTCEPSS rescore
  57. 2026-07-01 15:06 UTCEPSS rescore
  58. 2026-07-01 14:06 UTCGHSA enrichment
  59. 2026-07-01 01:58 UTCGHSA enrichment
  60. 2026-06-30 23:22 UTCEPSS rescore
  61. 2026-06-30 13:49 UTCGHSA enrichment
  62. 2026-06-30 01:41 UTCGHSA enrichment
  63. 2026-06-29 13:33 UTCEG score recompute
  64. 2026-06-29 13:32 UTCMITRE cvelistV5first tracked

Related CVEs(same vendor + same CWE)

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 0% probability of exploitation in the next 30 days, which ranks it in the top 78.6% of all scored CVEs.
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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