How severe is GHSA-mw35-8rx3-xf9r?

No CVSS score has been assigned to GHSA-mw35-8rx3-xf9r yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by GHSA-mw35-8rx3-xf9r?

GHSA-mw35-8rx3-xf9r affects the following packages: ray (PyPI). Ecosystems affected: PyPI.

How do I fix GHSA-mw35-8rx3-xf9r?

Update ray to 2.55.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-mw35-8rx3-xf9r is resolved across your whole dependency graph.

How do I detect GHSA-mw35-8rx3-xf9r in my PyPI dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for ray. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.

How do I mitigate GHSA-mw35-8rx3-xf9r if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

How does O3 Security protect against GHSA-mw35-8rx3-xf9r?

O3 pinpoints whether GHSA-mw35-8rx3-xf9r is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.

Is GHSA-mw35-8rx3-xf9r actively exploited in the wild?

No public exploit code has been indexed for GHSA-mw35-8rx3-xf9r yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What type of vulnerability is GHSA-mw35-8rx3-xf9r?

GHSA-mw35-8rx3-xf9r is classified as Code Injection (CWE-94), Deserialization of Untrusted Data (CWE-502). These weakness types describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

When was GHSA-mw35-8rx3-xf9r published, and has it been updated?

GHSA-mw35-8rx3-xf9r was published on April 24, 2026 and was last updated on July 13, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐍 PyPI

GHSA-mw35-8rx3-xf9r

GHSA-mw35-8rx3-xf9r is a Code Injection vulnerability in ray. O3 Security confirms whether GHSA-mw35-8rx3-xf9r is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.

Ray: Remote Code Execution via Parquet Arrow Extension Type Deserialization

Also known asCVE-2026-41486PYSEC-2026-2272PYSEC-2026-2296

Published

Apr 24, 2026

Updated

Jul 13, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Blast Radius

1 pkg affected

🐍ray

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.

Description

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.

In May 2024, Ray fixed a related vulnerability in PyExtensionType-based extension types (issue #41314, PR #45084). In July 2025, PR #54831 introduced cloudpickle.loads() into the replacement extension types' deserialization path, reintroducing the same class of vulnerability.

Impact

Affected versions: Ray 2.49.0 through 2.54.0 (latest release as of March 2026). The vulnerable _deserialize_with_fallback function with cloudpickle.loads() was introduced in commit f6d21db1a4 (PR #54831, July 2025), first released in Ray 2.49.0.
Affected configurations: Any process that uses Ray Data and reads Parquet files. The extension types are registered globally in PyArrow, so all Parquet reads in the process are affected, including ray.data.read_parquet(), pyarrow.parquet.read_table(), pandas.read_parquet(), etc.
Attacker prerequisites: The attacker must place a crafted Parquet file where a Ray Data pipeline reads it. No authentication or cluster access is required. The Parquet file must contain a column with a ray.data.arrow_tensor (or v2, or variable-shaped) extension type name, which makes this a targeted attack against Ray Data users.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐍PyPI	`ray`	≥ 2.49.0&&< 2.55.0	2.55.0

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for ray. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Fix
Update ray to 2.55.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-mw35-8rx3-xf9r is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 pinpoints whether GHSA-mw35-8rx3-xf9r is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.

Tailored to GHSA-mw35-8rx3-xf9r. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

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. In May 2024, Ray fixed a related vulnerability in `PyExtensionType`-based extension types ([issue #41314](https://github.com/ray-p

O3 Security · Impact-Aware SCA

Is GHSA-mw35-8rx3-xf9r in your dependencies?

O3 detects GHSA-mw35-8rx3-xf9r across PyPI dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

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