CVE-2026-41486

HIGHNVD 8.88.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

This high-severity CVE scores 8.8 under NVD CVSS v3. EPSS exploit probability: 0.7% (52nd percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3
8.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.7%CVSS: 8.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Ray is an AI compute engine. From version 2.54.0 to before version 2.55.0, Ray Data registers custom Arrow extension types (ray.data.arrow_tensor, ray.data.arrow_tensor_v2, ray.data.arrow_variable_shaped_tensor) globally in PyArrow. When PyArrow reads a Parquet file containing one of these extension types, it calls __arrow_ext_deserialize__ on the field's metadata bytes. Ray's implementation passes these bytes directly to cloudpickle.loads(), achieving arbitrary code execution during schema parsing, before any row data is read. This issue has been patched in version 2.55.0.

CVSS v3
8.8
EG Score
8.8HIGHmedium confidence
EG Risk
55
EG Risk 55/100

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 (value × EchelonGraph’s weight)
Severity88% × 45%
The EG Score, 8.8 of 10.
Exploitation0.7% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.7%
EPSS %ILE
52nd
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)3 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

May 8, 2026

Last Modified

May 18, 2026

Advisory Details (4)

Auto-updated May 9, 2026
Patch available. Sources: github.
GitHub advisoryMentions a patch (unverified)

Remote Code Execution via Parquet Arrow Extension Type Deserialization · Advisory · ray-project/ray · GitHub

https://github.com/ray-project/ray/security/advisories/GHSA-mw35-8rx3-xf9r
Web page

Release Ray-2.55.0 · ray-project/ray · GitHub

https://github.com/ray-project/ray/releases/tag/ray-2.55.0
Web page

[Data] Fix RCE in Arrow extension type deserialization from Parquet by goutamvenkat-anyscale · Pull Request #62056 · ray-project/ray · GitHub

https://github.com/ray-project/ray/pull/62056
Web page

[Data] Fix RCE in Arrow extension type deserialization from Parquet (… · ray-project/ray@c02bd31 · GitHub

https://github.com/ray-project/ray/commit/c02bd31ae31996805868baa446a131a8d304525f

Affected Packages

(2 across 1 ecosystem)
PyPI(2)
PackageVulnerable rangeFix by version rangeDependents
ray0.1.1 ... 2.9.3 (125 versions)
  • 2.49.0 up to 2.55.0: fixed in 2.55.0
  • every version through 2.54.0: no fix on record
—
ve-ray2.44.0.1, 2.44.0.2, 2.46.0.0, 2.46.0.1, 2.46.0.2
  • every version through 2.54.0: no fix on record
—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 27× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 99 of 180 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 1 repeat row among the latest 100 is merged into the row it repeats. The 81 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  2. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  3. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  4. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  5. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  6. 2026-10-12 16:08 UTCEG score recompute
  7. 2026-10-11 19:50 UTCEG score recompute
  8. 2026-10-11 17:04 UTCEG score recompute
  9. 2026-10-11 14:30 UTCEG score recompute
  10. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  11. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  12. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  13. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  14. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  15. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  16. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  17. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  18. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  19. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  20. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  21. 2026-09-30 07:58 UTCOSV refresh
  22. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  23. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  24. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  25. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.5% · 40th percentile
Show 74 more
  1. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  2. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  3. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  4. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  5. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  6. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  7. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  8. 2026-09-11 14:23 UTCOSV refresh
  9. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  10. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  11. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  12. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  13. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  14. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  15. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  16. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  17. 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  18. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  19. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  20. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  21. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  22. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  23. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  24. 2026-08-23 18:59 UTCEG score recompute
  25. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  26. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  27. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  28. 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  29. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  30. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  31. 2026-08-17 11:29 UTCEG score recompute
  32. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  33. 2026-08-16 04:32 UTCEG score recompute
  34. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  35. 2026-08-15 01:54 UTCEG score recompute
  36. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  37. 2026-08-14 03:06 UTCEG score recompute
  38. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  39. 2026-08-12 16:42 UTCEG score recompute
  40. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  41. 2026-08-11 15:50 UTCEG score recompute
  42. 2026-08-11 13:43 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  43. 2026-08-11 01:15 UTCEG score recompute
  44. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  45. 2026-08-10 01:08 UTCEG score recompute
  46. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  47. 2026-08-09 02:23 UTCEG score recompute
  48. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  49. 2026-08-07 19:40 UTCEG score recompute
  50. 2026-08-06 20:52 UTCEG score recompute
  51. 2026-08-06 13:46 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  52. 2026-08-05 22:07 UTCEG score recompute
  53. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  54. 2026-08-04 15:10 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  55. 2026-08-04 10:38 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  56. 2026-08-03 19:29 UTCEG score recompute
  57. 2026-08-03 10:36 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  58. 2026-08-02 02:39 UTCEG score recompute
  59. 2026-08-02 02:27 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  60. 2026-08-01 04:16 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  61. 2026-07-30 16:28 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  62. 2026-07-30 01:30 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  63. 2026-07-28 15:36 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  64. 2026-07-27 14:13 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  65. 2026-07-26 14:54 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  66. 2026-07-25 14:18 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  67. 2026-07-24 14:17 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  68. 2026-07-23 14:18 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  69. 2026-07-23 03:11 UTCEG score recompute
  70. 2026-07-22 14:08 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  71. 2026-07-21 15:24 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  72. 2026-07-20 17:08 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  73. 2026-07-19 14:31 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  74. 2026-07-19 02:29 UTCEPSS rescoreEPSS 0.5% · 37th percentile

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Frequently asked(5)

What is CVE-2026-41486?
CVE-2026-41486 is a high-severity vulnerability; its CVE record was published on May 8, 2026. Ray is an AI compute engine. From version 2.54.0 to before version 2.55.0, Ray Data registers custom Arrow extension types (ray.data.arrowtensor, ray.data.arrowtensorv2, ray.data.arrowvariableshapedtensor) globally in PyArrow. When PyArrow reads a Parquet file containing one of these extension…
When was the CVE record for CVE-2026-41486 published?
The CVE record for CVE-2026-41486 was published on May 8, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of May 18, 2026; the record at its source may have been updated since.
Is CVE-2026-41486 actively exploited?
CVE-2026-41486 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.7% probability of exploitation in the next 30 days (52nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-41486?
CVE-2026-41486 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-41486?
A fix for CVE-2026-41486 is available: update to the fixed version the vendor names in its advisory.

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