CVE-2026-41486: Ray is an AI compute engine

This month

HIGH 8.8DOWNGRADE

CVE-2026-41486 is a high-severity flaw (CVSS 8.8) affecting ray. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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(), ach

Why this priority

High severity

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.5% (top 59%)
CISA exploited list	No
Weakness	CWE-94, CWE-502
Published	2026-05-08
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: anyscale

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-08 22:16 UTCPublished CVE record published
2026-06-17 10:46 UTCUpdated Record last modified

anyscale ray DOWNGRADE

Affected: 2.54.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.54.0

1. Check installed version

apt-cache policy ray || rpm -q ray || ray --version

2. No fixed release: DOWNGRADE to a release before 2.54.0 (Debian / Ubuntu)

apt-cache madison ray sudo apt install ray=<VERSION_BEFORE_2.54.0> sudo apt-mark hold ray

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list ray sudo dnf downgrade ray-<VERSION_BEFORE_2.54.0> sudo dnf versionlock add ray

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-41486?

ray: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-41486 being exploited?

CVE-2026-41486 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-41486 affect?

CVE-2026-41486 affects ray. Severity is high (CVSS 8.8). 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 Py

How urgent is CVE-2026-41486?

Priority 41/100. High severity

Related CVEs

CVE-2026-57516 HIGH 8.8 UPGRADE Ray prior to 2.56.0 contains an unsafe deserialization vulnerability in the WebDataset reader that allows atta

References

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