CVE-2026-40890

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.1%, top 77% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.5Exploit: NoneExposed: 0

A fix is available — apply it.

The package github.com/gomarkdown/markdown is a Go library for parsing Markdown text and rendering as HTML. Processing a malformed input containing a < character that is not followed by a > character anywhere in the remaining text with a SmartypantsRenderer will lead to Out of Bounds read or a panic. This vulnerability is fixed with commit 759bbc3e32073c3bc4e25969c132fc520eda2778.

CVSS v3
7.5
EG Score
7.5(medium)
EPSS
26.7%
KEV
Not listed

Published

April 21, 2026

Last Modified

April 27, 2026

Advisory Details (2)

Auto-updated Jun 7, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github.
github Patch Available🟡 PoC Available

Out-of-bounds Read in SmartypantsRenderer · Advisory · gomarkdown/markdown · GitHub

https://github.com/gomarkdown/markdown/security/advisories/GHSA-77fj-vx54-gvh7
github_commit

commit 759bbc3e3207 (gomarkdown/markdown)

Fix landed in gomarkdown/markdown commit 759bbc3e3207 — awaiting tagged release

https://github.com/gomarkdown/markdown/commit/759bbc3e32073c3bc4e25969c132fc520eda2778

Vendor Advisories for CVE-2026-40890(6)

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

Patch Availability(5)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatmulticluster-globalhub/multicluster-globalhub-grafana-rhel9:17799252732026-06-08redhat
redhatrhacm2/acm-grafana-rhel9:17806770032026-06-08redhat
redhatmulticluster-globalhub/multicluster-globalhub-grafana-rhel9:17801671182026-06-04redhat
redhatmulticluster-globalhub/multicluster-globalhub-grafana-rhel9:17795794392026-06-01redhat
redhatmulticluster-globalhub/multicluster-globalhub-grafana-rhel9:17788677532026-05-28redhat

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.

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFixed inDependents
github.com/gomarkdown/markdown—0.0.0-20260411013819-759bbc3e3207—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 37× 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 125 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-40890?
CVE-2026-40890 is a high vulnerability published on April 21, 2026. The package github.com/gomarkdown/markdown is a Go library for parsing Markdown text and rendering as HTML. Processing a malformed input containing a < character that is not followed by a > character anywhere in the remaining text with a SmartypantsRenderer will lead to Out of Bounds read or a…
When was CVE-2026-40890 disclosed?
CVE-2026-40890 was first published in the National Vulnerability Database on April 21, 2026, with the most recent update on April 27, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-40890 actively exploited?
CVE-2026-40890 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 26.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-40890?
CVE-2026-40890 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-40890?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-40890, 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.

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