CVE-2026-40504

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-04-16. a secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Elevated
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: Elevated riskExposed: 0

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

Creolabs Gravity before 0.9.6 contains a heap buffer overflow vulnerability in the gravity_vm_exec function that allows attackers to write out-of-bounds memory by crafting scripts with many string literals at global scope. Attackers can exploit insufficient bounds checking in gravity_fiber_reassign() to corrupt heap metadata and achieve arbitrary code execution in applications that evaluate untrusted scripts.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
75(Attend)
EG Risk 75/100SSVC: 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
Severity98% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
1%
EPSS %ILE
49%
KEV
Not listed

Published

April 16, 2026

Last Modified

July 14, 2026

Advisory Details (4)

Auto-updated Sep 12, 2026
Patch available. Sources: github_commit, github_release.
generic

Creolabs Gravity < 0.9.6 Heap Buffer Overflow via gravity_vm_exec | Advisories | VulnCheck

https://www.vulncheck.com/advisories/creolabs-gravity-heap-buffer-overflow-via-gravity-vm-exec
github_release Patch Available

Gravity v0.9.6

Patch available: marcobambini/gravity 0.9.6

https://github.com/marcobambini/gravity/releases/tag/0.9.6
generic

heap-buffer-overflow in gravity_vm_exec with many string literals + recursion · Issue #437 · marcobambini/gravity · GitHub

https://github.com/marcobambini/gravity/issues/437
github_commit Patch Available

commit 18b9195598d9 (marcobambini/gravity)

Patch available: marcobambini/gravity 0.9.6 (contains commit 18b9195598d9)

https://github.com/marcobambini/gravity/commit/18b9195598d9b944376754c6d1ad76e38a4adca1

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 28× 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 236 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-40504?
CVE-2026-40504 is a critical vulnerability published on April 16, 2026. Creolabs Gravity before 0.9.6 contains a heap buffer overflow vulnerability in the gravityvmexec function that allows attackers to write out-of-bounds memory by crafting scripts with many string literals at global scope. Attackers can exploit insufficient bounds checking in gravityfiberreassign()…
When was CVE-2026-40504 disclosed?
CVE-2026-40504 was first published in the National Vulnerability Database on April 16, 2026, with the most recent update on July 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-40504 actively exploited?
CVE-2026-40504 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 51.2% of all scored CVEs.
What is the CVSS score of CVE-2026-40504?
CVE-2026-40504 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-40504?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-40504, 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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