CVE-2026-31226

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-05-12. NVD baseline CVSS 9.8; sources differ by 0.0.

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

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

The TinyZero project thru commit 6652a63c57fa7e5ccde3fc9c598c7176ff15b839 (2025-58-24) contains a critical command injection vulnerability (CWE-78) in its HDFS file operation utilities. The vulnerability arises from the unsafe construction and execution of shell commands via os.system() without proper input sanitization or escaping. User-controlled input (such as file paths) is directly interpolated into shell command strings using f-strings within the _copy() function. An attacker can inject arbitrary OS commands by supplying a specially crafted path parameter through the Hydra configuration framework. This leads to remote code execution with the privileges of the user running the TinyZero training process.

CVSS v3
9.8
EG Score
9.8(medium)
EPSS
63.5%
KEV
Not listed

Published

May 12, 2026

Last Modified

May 19, 2026

Advisory Details (2)

Auto-updated Jun 21, 2026
No patch confirmed yet.
generic

Notion

https://www.notion.so/CVE-2026-31226-35d1e139318881d19af5d63095c74579
generic

GitHub - Jiayi-Pan/TinyZero: Minimal reproduction of DeepSeek R1-Zero · GitHub

https://github.com/Jiayi-Pan/TinyZero

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 61× 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 298 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. 2026-07-15 02:00 UTCEPSS rescore
  5. 2026-07-13 22:30 UTCEPSS rescore
  6. 2026-07-12 05:46 UTCEPSS rescore
  7. 2026-07-11 08:27 UTCEPSS rescore
  8. 2026-07-09 19:10 UTCEPSS rescore
  9. 2026-07-08 15:15 UTCEPSS rescore
  10. 2026-07-07 13:46 UTCEPSS rescore
  11. 2026-07-06 16:27 UTCEPSS rescore
  12. 2026-07-06 16:27 UTCEPSS rescore
  13. 2026-07-06 02:23 UTCEPSS rescore
  14. 2026-07-06 02:23 UTCEPSS rescore
  15. 2026-07-05 02:30 UTCEPSS rescore
  16. 2026-07-04 06:31 UTCEPSS rescore
  17. 2026-07-01 15:06 UTCEPSS rescore
  18. 2026-06-30 23:22 UTCEPSS rescore
  19. 2026-06-29 14:06 UTCEPSS rescore
  20. 2026-06-29 14:06 UTCEPSS rescore
  21. 2026-06-28 14:07 UTCEPSS rescore
  22. 2026-06-28 14:07 UTCEPSS rescore
  23. 2026-06-28 13:28 UTCEG score recompute
  24. 2026-06-28 13:28 UTCGHSA enrichment
  25. 2026-06-28 08:24 UTCEG score recompute
Show 75 more
  1. 2026-06-28 08:24 UTCGHSA enrichment
  2. 2026-06-28 04:56 UTCEPSS rescore
  3. 2026-06-28 04:56 UTCEPSS rescore
  4. 2026-06-28 02:20 UTCEG score recompute
  5. 2026-06-28 02:20 UTCGHSA enrichment
  6. 2026-06-27 13:17 UTCEG score recompute
  7. 2026-06-27 13:17 UTCGHSA enrichment
  8. 2026-06-27 08:25 UTCEG score recompute
  9. 2026-06-27 08:25 UTCGHSA enrichment
  10. 2026-06-27 03:08 UTCEPSS rescore
  11. 2026-06-26 20:55 UTCEG score recompute
  12. 2026-06-26 20:55 UTCGHSA enrichment
  13. 2026-06-26 04:02 UTCEG score recompute
  14. 2026-06-26 04:02 UTCGHSA enrichment
  15. 2026-06-25 22:02 UTCEG score recompute
  16. 2026-06-25 22:02 UTCGHSA enrichment
  17. 2026-06-25 13:49 UTCEPSS rescore
  18. 2026-06-25 13:49 UTCEPSS rescore
  19. 2026-06-24 14:05 UTCEPSS rescore
  20. 2026-06-23 21:33 UTCEPSS rescore
  21. 2026-06-23 21:33 UTCEPSS rescore
  22. 2026-06-22 14:25 UTCEPSS rescore
  23. 2026-06-22 14:25 UTCEPSS rescore
  24. 2026-06-21 14:56 UTCEPSS rescore
  25. 2026-06-21 14:56 UTCEPSS rescore
  26. 2026-06-21 01:59 UTCEPSS rescore
  27. 2026-06-19 19:25 UTCEPSS rescore
  28. 2026-06-19 19:25 UTCEPSS rescore
  29. 2026-06-18 17:52 UTCEPSS rescore
  30. 2026-06-18 17:52 UTCEPSS rescore
  31. 2026-06-17 17:53 UTCEPSS rescore
  32. 2026-06-17 05:14 UTCEG score recompute
  33. 2026-06-17 05:14 UTCGHSA enrichment
  34. 2026-06-17 00:23 UTCEG score recompute
  35. 2026-06-17 00:23 UTCGHSA enrichment
  36. 2026-06-16 17:52 UTCEPSS rescore
  37. 2026-06-16 11:45 UTCEG score recompute
  38. 2026-06-16 11:45 UTCGHSA enrichment
  39. 2026-06-16 06:42 UTCEG score recompute
  40. 2026-06-16 06:42 UTCGHSA enrichment
  41. 2026-06-15 17:49 UTCEPSS rescore
  42. 2026-06-15 06:29 UTCEG score recompute
  43. 2026-06-15 06:29 UTCGHSA enrichment
  44. 2026-06-15 02:30 UTCEG score recompute
  45. 2026-06-15 02:30 UTCGHSA enrichment
  46. 2026-06-14 23:18 UTCEPSS rescore
  47. 2026-06-14 22:32 UTCEG score recompute
  48. 2026-06-14 22:32 UTCGHSA enrichment
  49. 2026-06-14 18:32 UTCEG score recompute
  50. 2026-06-14 18:32 UTCGHSA enrichment
  51. 2026-06-14 14:33 UTCEG score recompute
  52. 2026-06-14 14:33 UTCGHSA enrichment
  53. 2026-06-14 10:34 UTCEG score recompute
  54. 2026-06-14 10:34 UTCGHSA enrichment
  55. 2026-06-14 06:35 UTCEG score recompute
  56. 2026-06-14 06:34 UTCGHSA enrichment
  57. 2026-06-14 00:57 UTCEG score recompute
  58. 2026-06-14 00:57 UTCGHSA enrichment
  59. 2026-06-13 23:00 UTCEPSS rescore
  60. 2026-06-13 09:43 UTCEG score recompute
  61. 2026-06-13 09:43 UTCGHSA enrichment
  62. 2026-06-13 05:31 UTCEG score recompute
  63. 2026-06-13 05:31 UTCGHSA enrichment
  64. 2026-06-13 01:04 UTCEG score recompute
  65. 2026-06-13 01:04 UTCGHSA enrichment
  66. 2026-06-12 23:12 UTCEPSS rescore
  67. 2026-06-12 23:12 UTCEPSS rescore
  68. 2026-06-12 21:00 UTCEG score recompute
  69. 2026-06-12 21:00 UTCGHSA enrichment
  70. 2026-06-12 17:01 UTCEG score recompute
  71. 2026-06-12 17:01 UTCGHSA enrichment
  72. 2026-06-12 12:54 UTCEG score recompute
  73. 2026-06-12 12:54 UTCGHSA enrichment
  74. 2026-06-12 08:51 UTCEG score recompute
  75. 2026-06-12 08:51 UTCGHSA enrichment

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Frequently asked(5)

What is CVE-2026-31226?
CVE-2026-31226 is a critical vulnerability published on May 12, 2026. The TinyZero project thru commit 6652a63c57fa7e5ccde3fc9c598c7176ff15b839 (2025-58-24) contains a critical command injection vulnerability (CWE-78) in its HDFS file operation utilities. The vulnerability arises from the unsafe construction and execution of shell commands via os.system() without…
When was CVE-2026-31226 disclosed?
CVE-2026-31226 was first published in the National Vulnerability Database on May 12, 2026, with the most recent update on May 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-31226 actively exploited?
CVE-2026-31226 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 63.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-31226?
CVE-2026-31226 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-31226?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-31226, 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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