---
id: CVE-2026-92287
title: >-
  Apache Arrow C++, PyArrow: Parquet file-controlled KMS URL is forwarded to
  pluggable KmsClient that skips host validation
summary: >-
  Pass-through of unvalidated KMS URLs to KMS clients in Apache C++ Parquet and
  PyArrow versions 4.0.0 to 25.0.1.





  This affects users who read Parquet files and configure Parquet decryption
  properties with a KmsClient implementation.



  …
severity: high
cvss: 8.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N'
cvssSource: adp
cwe:
  - CWE-20
  - CWE-918
vendor: Apache Software Foundation
product: Apache Arrow C++
affected:
  - apache_arrow_c++ >= 4.0.0 < 26.0.0
  - pyarrow >= 8.0.0 < 26.0.0
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-29T18:12:27.570580Z'
published: '2026-10-20'
updated: '2026-10-29'
sourceUpdated: '2026-10-29T18:12:50.412Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-92287'
references:
  - url: 'https://github.com/apache/arrow/issues/51349'
  - url: 'https://lists.apache.org/thread/0t6vry0msbk9dpsd0xv395ov5b84hj57'
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-92287.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-92287'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2556026'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-92287'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-92287'
tags:
  - cve.org
  - csaf
  - vex
  - red-hat
  - score-dispute
epss: 0.00352
epssPercentile: 0.28896
scores:
  adp: 8.1
  vendor: 4.7
ingestedAt: '2026-10-20T12:05:07.348Z'
---

## Overview

Pass-through of unvalidated KMS URLs to KMS clients in Apache C++ Parquet and PyArrow versions 4.0.0 to 25.0.1.




This affects users who read Parquet files and configure Parquet decryption properties with a KmsClient implementation.




On the reader side, the KMS URL can be application-controlled (specified in the KmsConnectionConfig) or file-controlled.
If the user does not leverage application control for this parameter, a file-controlled KMS URL is forwarded to a pluggable KmsClient implementation. 
If the KMS implementation does not perform host validation and makes use of the provided KMS URL, a KMS token can be sent to a malicious host set by an attacker in the file. 




Users are recommended to upgrade to version 26.0.0, which disables this behavior by default and requires that users opt-in to it by enabling the read_kms_url flag in the DecryptionConfiguration. Users of affected versions are recommended to either specify the KMS URL in the KmsConnectionConfig when reading files, or ensure any KmsClient implementations validate received KMS URLs. Users that opt-in to file-controlled KMS URLs in version 26.0.0 and later must ensure KmsClients validate KMS URLs.

## Affected

- `apache_arrow_c++ >= 4.0.0 < 26.0.0`
- `pyarrow >= 8.0.0 < 26.0.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Exploit Intelligence, Lightspeed Core, Migration Toolkit for Applications 8, OpenShift Lightspeed, Red Hat AI Inference Server, Red Hat Ceph Storage 7, … · no fix planned: Exploit Intelligence, Lightspeed Core, Migration Toolkit for Applications 8, OpenShift Lightspeed, … · updated 2026-10-20 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-92287.json)