CVE-2026-45227

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-05-13. a secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Elevated
8.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.8Exploit: NoneExposed: 0

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

Heym before 0.0.21 contains a sandbox escape vulnerability in the custom Python tool executor that allows authenticated workflow authors to bypass sandbox restrictions by using object-graph introspection primitives. Attackers can use Python introspection techniques to recover the unrestricted __import__ function, import blocked modules such as os and subprocess, and access inherited backend environment variables containing database credentials and encryption keys to execute arbitrary host commands as the backend service user.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
56(Track*)
EG Risk 56/100SSVC: 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%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS
13.6%
KEV
Not listed

Published

May 12, 2026

Last Modified

July 14, 2026

Advisory Details (4)

Auto-updated May 12, 2026
No patch confirmed yet.
generic

Heym < 0.0.21 Sandbox Escape via Python Introspection | Advisories | VulnCheck

https://www.vulncheck.com/advisories/heym-sandbox-escape-via-python-introspection
generic

Release v0.0.21 · heymrun/heym · GitHub

https://github.com/heymrun/heym/releases/tag/v0.0.21
generic

[security] fix(tools): harden Python tool sandbox by Hinotoi-agent · Pull Request #94 · heymrun/heym · GitHub

https://github.com/heymrun/heym/pull/94
generic

Merge pull request #94 from Hinotoi-agent/fix/python-tool-sandbox-escape · heymrun/heym@32b7e80 · GitHub

https://github.com/heymrun/heym/commit/32b7e809d987d9b018ec8daa2cdaf48f627f26f1

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 38× 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 121 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-45227?
CVE-2026-45227 is a high vulnerability published on May 12, 2026. Heym before 0.0.21 contains a sandbox escape vulnerability in the custom Python tool executor that allows authenticated workflow authors to bypass sandbox restrictions by using object-graph introspection primitives. Attackers can use Python introspection techniques to recover the unrestricted…
When was CVE-2026-45227 disclosed?
CVE-2026-45227 was first published in the National Vulnerability Database on May 12, 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-2026-45227 actively exploited?
CVE-2026-45227 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 13.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-45227?
CVE-2026-45227 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-45227?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-45227, 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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