CVE-2026-38976

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH 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: 0%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(high)
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
0%
EPSS %ILE
37%
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 24× in last 7d / 67× 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.

  1. 2026-08-01 01:56 UTCGHSA enrichment
  2. 2026-07-31 12:25 UTCGHSA enrichment
  3. 2026-07-30 23:26 UTCEG score recompute
  4. 2026-07-30 23:26 UTCGHSA enrichment
  5. 2026-07-30 16:28 UTCEPSS rescore
  6. 2026-07-30 10:31 UTCEG score recompute
  7. 2026-07-30 10:30 UTCGHSA enrichment
  8. 2026-07-30 01:30 UTCEPSS rescore
  9. 2026-07-29 21:35 UTCGHSA enrichment
  10. 2026-07-29 07:04 UTCGHSA enrichment
  11. 2026-07-28 18:07 UTCEG score recompute
  12. 2026-07-28 18:07 UTCGHSA enrichment
  13. 2026-07-28 05:04 UTCGHSA enrichment
  14. 2026-07-27 15:47 UTCEG score recompute
  15. 2026-07-27 15:47 UTCGHSA enrichment
  16. 2026-07-27 14:13 UTCEPSS rescore
  17. 2026-07-27 01:44 UTCEG score recompute
  18. 2026-07-27 01:44 UTCGHSA enrichment
  19. 2026-07-26 14:54 UTCEPSS rescore
  20. 2026-07-26 14:54 UTCEPSS rescore
  21. 2026-07-26 12:50 UTCEG score recompute
  22. 2026-07-26 12:50 UTCGHSA enrichment
  23. 2026-07-25 14:18 UTCEPSS rescore
  24. 2026-07-25 14:18 UTCEPSS rescore
  25. 2026-07-24 14:17 UTCEPSS rescore
Show 42 more
  1. 2026-07-24 14:17 UTCEPSS rescore
  2. 2026-07-23 14:18 UTCEPSS rescore
  3. 2026-07-23 14:18 UTCEPSS rescore
  4. 2026-07-23 03:10 UTCEG score recompute
  5. 2026-07-22 14:08 UTCEPSS rescore
  6. 2026-07-21 15:24 UTCEPSS rescore
  7. 2026-07-20 17:08 UTCEPSS rescore
  8. 2026-07-19 14:31 UTCEPSS rescore
  9. 2026-07-19 02:29 UTCEPSS rescore
  10. 2026-07-18 10:04 UTCEPSS rescore
  11. 2026-07-17 06:09 UTCGHSA enrichment
  12. 2026-07-16 17:13 UTCGHSA enrichment
  13. 2026-07-16 17:03 UTCEPSS rescore
  14. 2026-07-16 03:38 UTCGHSA enrichment
  15. 2026-07-15 16:57 UTCEPSS rescore
  16. 2026-07-15 16:57 UTCEPSS rescore
  17. 2026-07-15 14:42 UTCGHSA enrichment
  18. 2026-07-15 02:00 UTCEPSS rescore
  19. 2026-07-15 01:45 UTCGHSA enrichment
  20. 2026-07-14 12:50 UTCGHSA enrichment
  21. 2026-07-13 23:55 UTCGHSA enrichment
  22. 2026-07-13 22:30 UTCEPSS rescore
  23. 2026-07-13 11:00 UTCGHSA enrichment
  24. 2026-07-13 06:13 UTCEPSS rescore
  25. 2026-07-13 06:13 UTCEPSS rescore
  26. 2026-07-12 22:05 UTCGHSA enrichment
  27. 2026-07-12 09:09 UTCGHSA enrichment
  28. 2026-07-12 05:46 UTCEPSS rescore
  29. 2026-07-11 20:14 UTCGHSA enrichment
  30. 2026-07-11 08:27 UTCEPSS rescore
  31. 2026-07-11 07:20 UTCGHSA enrichment
  32. 2026-07-10 18:26 UTCGHSA enrichment
  33. 2026-07-10 05:28 UTCGHSA enrichment
  34. 2026-07-09 19:10 UTCEPSS rescore
  35. 2026-07-09 16:33 UTCEG score recompute▲ 7.50
  36. 2026-07-09 16:33 UTCGHSA enrichment
  37. 2026-07-08 15:15 UTCEPSS rescore
  38. 2026-07-07 16:46 UTCMITRE cvelistV5CVSS v3 → 7.5 · severity → HIGH
  39. 2026-07-07 13:46 UTCEPSS rescore
  40. 2026-07-06 22:49 UTCNVD update
  41. 2026-07-06 21:45 UTCEG score recompute
  42. 2026-07-06 21:44 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

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 0% probability of exploitation in the next 30 days, which ranks it in the top 63.4% 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.

Dependency Blast Radius

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