How severe is CVE-2026-41486?

CVE-2026-41486 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-41486 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-41486?

CVE-2026-41486 affects Anyscale Ray. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-41486?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-41486 have an EU (EUVD) identifier?

Yes. CVE-2026-41486 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-28828.

When was CVE-2026-41486 published?

CVE-2026-41486 was published on 2026-05-08 and last updated on 2026-06-17.

CVE-2026-41486

CVE-2026-41486 is a high-severity vulnerability in Anyscale Ray with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-94.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v4: 8.9
EPSS exploit prediction: 1% (52nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-28828
Weakness: CWE-94
Affected product: Anyscale Ray
Published: 2026-05-08
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2026-41486?: 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.
How severe is CVE-2026-41486?: CVE-2026-41486 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-41486 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-41486?: CVE-2026-41486 affects Anyscale Ray. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-41486?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-41486 have an EU (EUVD) identifier?: Yes. CVE-2026-41486 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-28828.
When was CVE-2026-41486 published?: CVE-2026-41486 was published on 2026-05-08 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:anyscale:ray:2.54.0:*:*:*:*:*:*:*

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