CVE-2026-49493

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-06-05. the CNA's CVSS baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:vulncheck, epss, ghsa
Trending — 3 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

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

Markdown Preview Enhanced before 0.8.28 parses Bitfield fenced code blocks with interpretJS(), which evaluates the block content as code via vm.runInNewContext(), allowing arbitrary code execution. A crafted markdown document containing a malicious bitfield code block executes attacker-controlled code on the server side when the document is rendered or exported. Fixed in 0.8.28 by parsing bitfield register definitions with JSON5.parse(), since they are purely data.

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%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
25%
KEV
Not listed

Published

June 5, 2026

Last Modified

June 9, 2026

Advisory Details (2)

Auto-updated Jun 5, 2026
Patch available. Sources: github_release.
generic

Markdown Preview Enhanced Arbitrary Code Execution via Bitfield interpretJS() | Advisories | VulnCheck

https://www.vulncheck.com/advisories/markdown-preview-enhanced-arbitrary-code-execution-via-bitfield-interpretjs
github_release Patch Available

0.8.28

Patch available: shd101wyy/vscode-markdown-preview-enhanced 0.8.28

https://github.com/shd101wyy/vscode-markdown-preview-enhanced/releases/tag/0.8.28

Vendor Advisories for CVE-2026-49493(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 18× in last 7d / 59× 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 149 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-49493?
CVE-2026-49493 is a high vulnerability published on June 5, 2026. Markdown Preview Enhanced before 0.8.28 parses Bitfield fenced code blocks with interpretJS(), which evaluates the block content as code via vm.runInNewContext(), allowing arbitrary code execution. A crafted markdown document containing a malicious bitfield code block executes attacker-controlled…
When was CVE-2026-49493 disclosed?
CVE-2026-49493 was first published in the National Vulnerability Database on June 5, 2026, with the most recent update on June 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-49493 actively exploited?
CVE-2026-49493 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 74.8% of all scored CVEs.
What is the CVSS score of CVE-2026-49493?
CVE-2026-49493 has a CVSS v4.0 base score of 8.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-49493?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-49493, 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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