Medium [CVE-2026-73334] KMS token disclosure due to missing host validation
This medium-severity Red Hat Linux advisory covers CVE-2026-73334 affecting Red Hat Fuse 7, Red Hat OpenShift AI (RHOAI).
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Summary
Potential problem for users of the org.apache.parquet.crypto.keytools package in Apache Parquet, versions 1.12 to 1.18. This package enables users to encrypt Parquet files via an envelope encryption mechanism that wraps (encrypts) data keys via a Key Management Service (KMS).
On the reader side, the KMS URL can be application-controlled or file-controlled. If the pluggable implementation does not perform host validation, a KMS token can be sent to a malicious host set by an attacker in the file.
Before the problem is fixed, users are recommended to leverage application control for KMS URL parameter in readers (versions 1.12-1.18). After the problem is fixed (presumably in version 1.19), the upgrade will disable file-controlled KMS URL by default.
The latter option will explicitly require (in the new parameter documentation) to validate the KMS URL and use authentication in the custom implementation of the KMS client plug in. A flaw was found in Apache Parquet Hadoop.
This could lead to the unauthorized disclosure of sensitive KMS tokens. Red Hat is aware of this vulnerability in Apache Parquet Java.
The issue affects applications that use file-controlled KMS URLs when reading encrypted Parquet files with a custom KMS client that does not validate the destination host. Red Hat rates this vulnerability as Moderate.
- < 1.12-1
Official advisory · high-confidence parse· fetched 13 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists. Confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 13 days ago·verify at source
Mitigation checklist
- Upgrade Apache Parquet Java to version 1.18.1 or later, which disables file-controlled KMS URLs by default. Until upgraded, applications should use an application-controlled KMS URL when reading encrypted Parquet files. If application control is not possible, validate the file-controlled KMS URL and use authentication in the custom KMS client implementation.
Official advisory · high-confidence parse· fetched 13 days ago·verify at source
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