CVE-2026-31220

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
9.8EG
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: None knownExposed: 0

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

PySyft (Syft Datasite/Server) versions 0.9.5 and earlier are vulnerable to remote code execution due to insufficient validation and sandboxing of user-submitted code. The system allows low-privileged users to submit Python functions (via @sy.syft_function()) for remote execution on the server. While a code approval mechanism exists, the submitted code undergoes no security checks for dangerous operations (e.g., file access, command execution). Once approved, the code is executed within the server process using exec() and eval() functions without proper isolation. A remote attacker can leverage this to execute arbitrary Python code on the server, leading to complete compromise of the server environment.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
59(Track)
EG Risk 59/100SSVC: 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
Severity98% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
48%
KEV
Not listed

Published

May 12, 2026

Last Modified

May 15, 2026

Advisory Details (2)

Auto-updated Aug 26, 2026
No patch confirmed yet.
generic

GitHub - OpenMined/PySyft: Perform data science on data that remains in someone else's server · GitHub

https://github.com/OpenMined/PySyft
generic

Notion

https://www.notion.so/CVE-2026-31220-35d1e1393188814186b9e00114a8aba7

Vendor Advisories for CVE-2026-31220(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
pipsyft—ghsa

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFixed inDependents
syft0.1.0a1 ... 0.9.5 (320 versions)——

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 94× 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 318 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-31220?
CVE-2026-31220 is a critical vulnerability published on May 12, 2026. PySyft (Syft Datasite/Server) versions 0.9.5 and earlier are vulnerable to remote code execution due to insufficient validation and sandboxing of user-submitted code. The system allows low-privileged users to submit Python functions (via @sy.syft_function()) for remote execution on the server.…
When was CVE-2026-31220 disclosed?
CVE-2026-31220 was first published in the National Vulnerability Database on May 12, 2026, with the most recent update on May 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-31220 actively exploited?
CVE-2026-31220 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 52.2% of all scored CVEs.
What is the CVSS score of CVE-2026-31220?
CVE-2026-31220 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-31220?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-31220, 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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