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. 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.

Timeline

1. Oct 20, 2026, 8:15 AM UTCCVE published
2. Oct 22, 2026, 9:34 PM UTCFirst seen by cve.now
3. Oct 29, 2026, 6:12 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: total

4. Oct 29, 2026, 6:12 PM UTCRecord last updated

Affected versions

• Apache Software Foundation Apache Arrow C++

  From 4.0.0 · fixed in 26.0.0

• pyarrow

  From 8.0.0 · fixed in 26.0.0

References 2