Live › vulnerability › CVE-2026-92287
Go to dashboardApache Parquet C++ and PyArrow 4.0.0 through 25.0.1 forward a KMS URL taken from the Parquet file itself to a pluggable KmsClient. If that KmsClient does not validate hosts, a KMS token can be sent to an attacker-chosen server.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-23 21:57 UTC. All times on this page are UTC.
Teams that read encrypted Parquet files with Parquet decryption properties and a custom KmsClient implementation are exposed, when the KMS URL comes from the file. Applications that pin the KMS URL in KmsConnectionConfig, or that only read unencrypted files, can skip it.
No product ranges from the sources yet.
pyarrow version with python -c "import pyarrow; print(pyarrow.__version__)", affected range 4.0.0 to 25.0.1KmsConnectionConfig sets a KMS URL explicitly26.0.0 or later, where file-controlled KMS URLs are disabled by defaultKmsConnectionConfig when reading files, or make the KmsClient validate received KMS URLsEach row is the first time that source carried this signal. The analyst’s rows are its own findings.
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.
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