CVE-2026-38976

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-07-07. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this weekElevated
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 7.5Exploit: Elevated riskExposed: 0

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

mrubyc through 3.4.1 was found to contain a NULL pointer dereference in src/vm.c in op_super() / OP_SUPER due to a missing runtime guard for top-level super.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
65(Attend)
EG Risk 65/100SSVC: Attend

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
Severity75% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
1%
EPSS %ILE
47%
KEV
Not listed

Published

July 6, 2026

Last Modified

July 7, 2026

Advisory Details (3)

Auto-updated Jul 7, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
generic

[BUG] Null pointer dereference in `OP_SUPER` via missing runtime guard for top-level `super` · Issue #276 · mrubyc/mrubyc · GitHub

https://github.com/mrubyc/mrubyc/issues/276
generic

GitHub - mrubyc/mrubyc: mruby/c is another implementation of mruby. · GitHub

https://github.com/mrubyc/mrubyc
github_commit

commit c4aa2a06bfdd (hayat01sh1da/mrubyc)

Fix landed in hayat01sh1da/mrubyc commit c4aa2a06bfdd — awaiting tagged release

https://github.com/hayat01sh1da/mrubyc/commit/c4aa2a06bfdd13a0f1ae5165c5760a2530314a42

Vendor Advisories for CVE-2026-38976(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 10× in last 7d / 77× 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 189 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-38976?
CVE-2026-38976 is a high vulnerability published on July 6, 2026. mrubyc through 3.4.1 was found to contain a NULL pointer dereference in src/vm.c in opsuper() / OPSUPER due to a missing runtime guard for top-level super.
When was CVE-2026-38976 disclosed?
CVE-2026-38976 was first published in the National Vulnerability Database on July 6, 2026, with the most recent update on July 7, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-38976 actively exploited?
CVE-2026-38976 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 52.8% of all scored CVEs.
What is the CVSS score of CVE-2026-38976?
CVE-2026-38976 has a CVSS v3.1 base score of 7.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-38976?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-38976, 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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