CVE-2026-12856

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM 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: 1%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(medium)
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%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
45%
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 / 65× 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.

Showing the most recent 100 of 286 total refreshes for this CVE.

  1. 2026-09-18 19:27 UTCEPSS rescore
  2. 2026-09-18 06:59 UTCEG score recompute
  3. 2026-09-18 06:59 UTCVendor advisory
  4. 2026-09-18 06:59 UTCGHSA enrichment
  5. 2026-09-16 05:14 UTCEPSS rescore
  6. 2026-09-14 00:53 UTCEG score recompute
  7. 2026-09-14 00:53 UTCVendor advisory
  8. 2026-09-14 00:53 UTCGHSA enrichment
  9. 2026-09-13 16:46 UTCEPSS rescore
  10. 2026-09-13 09:25 UTCVendor advisory
  11. 2026-09-13 09:25 UTCGHSA enrichment
  12. 2026-09-12 15:16 UTCEG score recompute
  13. 2026-09-12 15:16 UTCVendor advisory
  14. 2026-09-12 15:16 UTCGHSA enrichment
  15. 2026-09-12 15:00 UTCEPSS rescore
  16. 2026-09-11 14:52 UTCEPSS rescore
  17. 2026-09-11 09:36 UTCEPSS rescore
  18. 2026-09-10 09:34 UTCEPSS rescore
  19. 2026-09-08 22:00 UTCEPSS rescore
  20. 2026-09-07 16:01 UTCEPSS rescore
  21. 2026-09-06 14:44 UTCEG score recompute
  22. 2026-09-06 14:44 UTCVendor advisory
  23. 2026-09-06 14:44 UTCGHSA enrichment
  24. 2026-09-06 13:47 UTCEPSS rescore
  25. 2026-09-04 05:06 UTCEPSS rescore
Show 75 more
  1. 2026-09-02 14:11 UTCEPSS rescore
  2. 2026-09-01 13:53 UTCEPSS rescore
  3. 2026-09-01 04:39 UTCEPSS rescore
  4. 2026-08-30 19:17 UTCEPSS rescore
  5. 2026-08-30 18:46 UTCEG score recompute
  6. 2026-08-30 18:46 UTCVendor advisory
  7. 2026-08-30 18:46 UTCGHSA enrichment
  8. 2026-08-30 01:21 UTCEPSS rescore
  9. 2026-08-28 21:40 UTCEPSS rescore
  10. 2026-08-27 22:48 UTCEG score recompute
  11. 2026-08-27 22:48 UTCVendor advisory
  12. 2026-08-27 22:48 UTCGHSA enrichment
  13. 2026-08-27 14:24 UTCEPSS rescore
  14. 2026-08-25 13:48 UTCEPSS rescore
  15. 2026-08-25 00:48 UTCEG score recompute
  16. 2026-08-25 00:48 UTCVendor advisory
  17. 2026-08-25 00:48 UTCGHSA enrichment
  18. 2026-08-24 12:41 UTCEG score recompute
  19. 2026-08-24 12:41 UTCVendor advisory
  20. 2026-08-24 12:41 UTCGHSA enrichment
  21. 2026-08-23 22:20 UTCVendor advisory
  22. 2026-08-23 22:20 UTCGHSA enrichment
  23. 2026-08-23 09:55 UTCEG score recompute
  24. 2026-08-23 09:55 UTCVendor advisory
  25. 2026-08-23 09:55 UTCGHSA enrichment
  26. 2026-08-23 00:19 UTCEPSS rescore
  27. 2026-08-22 21:47 UTCVendor advisory
  28. 2026-08-22 21:47 UTCGHSA enrichment
  29. 2026-08-22 09:05 UTCEG score recompute
  30. 2026-08-22 09:05 UTCVendor advisory
  31. 2026-08-22 09:05 UTCGHSA enrichment
  32. 2026-08-21 23:48 UTCEPSS rescore
  33. 2026-08-21 18:16 UTCVendor advisory
  34. 2026-08-21 18:16 UTCGHSA enrichment
  35. 2026-08-21 06:07 UTCEG score recompute
  36. 2026-08-21 06:07 UTCVendor advisory
  37. 2026-08-21 06:07 UTCGHSA enrichment
  38. 2026-08-20 22:55 UTCEPSS rescore
  39. 2026-08-20 17:57 UTCVendor advisory
  40. 2026-08-20 17:57 UTCGHSA enrichment
  41. 2026-08-20 05:50 UTCEG score recompute
  42. 2026-08-20 05:50 UTCVendor advisory
  43. 2026-08-20 05:50 UTCGHSA enrichment
  44. 2026-08-19 17:03 UTCEPSS rescore
  45. 2026-08-19 12:36 UTCVendor advisory
  46. 2026-08-19 12:36 UTCGHSA enrichment
  47. 2026-08-18 23:11 UTCEG score recompute
  48. 2026-08-18 23:11 UTCVendor advisory
  49. 2026-08-18 23:11 UTCGHSA enrichment
  50. 2026-08-18 13:48 UTCEPSS rescore
  51. 2026-08-17 08:50 UTCVendor advisory
  52. 2026-08-17 08:50 UTCGHSA enrichment
  53. 2026-08-16 20:42 UTCEG score recompute
  54. 2026-08-16 20:42 UTCVendor advisory
  55. 2026-08-16 20:42 UTCGHSA enrichment
  56. 2026-08-16 14:56 UTCEPSS rescore
  57. 2026-08-16 08:34 UTCEG score recompute
  58. 2026-08-16 08:34 UTCVendor advisory
  59. 2026-08-16 08:34 UTCGHSA enrichment
  60. 2026-08-16 02:14 UTCEPSS rescore
  61. 2026-08-15 20:26 UTCVendor advisory
  62. 2026-08-15 20:26 UTCGHSA enrichment
  63. 2026-08-15 08:18 UTCEG score recompute
  64. 2026-08-15 08:18 UTCVendor advisory
  65. 2026-08-15 08:18 UTCGHSA enrichment
  66. 2026-08-15 01:30 UTCEPSS rescore
  67. 2026-08-14 20:10 UTCVendor advisory
  68. 2026-08-14 20:10 UTCGHSA enrichment
  69. 2026-08-14 08:02 UTCEG score recompute
  70. 2026-08-14 08:02 UTCVendor advisory
  71. 2026-08-14 08:02 UTCGHSA enrichment
  72. 2026-08-13 22:00 UTCEPSS rescore
  73. 2026-08-13 19:54 UTCVendor advisory
  74. 2026-08-13 19:54 UTCGHSA enrichment
  75. 2026-08-13 07:43 UTCVendor advisory

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 1% probability of exploitation in the next 30 days, which ranks it in the top 55.2% 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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