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
44%
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 33× in last 7d / 159× 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 248 total refreshes for this CVE.

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

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 56.5% 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

Explore the affected products and dependency analysis for CVE-2026-12856

Explore →

Is Your Infrastructure Affected by CVE-2026-12856?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs