Apache Polaris accepts literal `*` characters in namespace and table names. When it later builds temporary S3 access policies for delegated table access, those same characters appear to be reused unescaped in S3 IAM resource patterns and `s3:prefix` conditions. In S3 IAM policy matching, `*` is treated as a wildcard rather than as ordinary text. That means temporary credentials issued for one crafted table can match the storage path of a different table. In private testing against Polaris 1.4.0 using Polaris' AWS S3 temporary- credential path on both MinIO and real AWS S3, credentials returned for crafted tables such as `f*.t1`, `f*.*`, `*.*`, and `foo.*` could reach other tables' S3 locations. The confirmed behavior includes: - reading another table's metadata control file ([Iceberg metadata JSON]); - listing another table's exact S3 table prefix ([table prefix]); - and, when write delegation was returned for the crafted table, creating and deleting an object under another table's exact S3 table prefix. A control case using ordinary different names did not allow the same cross-table access. A least-privilege AWS S3 variant was also confirmed in which the attacker principal had no Polaris permissions on the victim table and only the minimal permissions required to create and use a crafted wildcard table (namespace-scoped `TABLE_CREATE` and `TABLE_WRITE_DATA` on `*`). In that setup, direct Polaris access to `foo.t1` remained forbidden, but the attacker could still create and load `*.*`, receive delegated S3 credentials, and use those credentials to list, read, create, and delete objects under `foo.t1`. In Iceberg, the metadata JSON file is a control file: it tells readers which data files belong to the table, which snapshots exist, and which table version to read. So unauthorized access to it is already a meaningful confidentiality problem. The confirmed write-capable variant means the issue is not limited to disclosure.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - Apache Polaris accepts literal `*` characters in namespace and table names. When it later builds temporary
    S3 access policies for delegated table access, those same characters appear to be reused unescaped in S3
    IAM resource patterns and `s3:prefix` conditions. In S3 IAM policy matching, `*` is treated as a wildcard
    rather than as ordinary text. That means temporary credentials issued for one crafted table can match the
    storage path of a different table. In private testing against Polaris 1.4.0 using Polaris' AWS S3
    temporary- credential path on both MinIO and real AWS S3, credentials returned for crafted tables such as
    `f*.t1`, `f*.*`, `*.*`, and `foo.*` could reach other tables' S3 locations. The confirmed behavior
    includes: - reading another table's metadata control file ([Iceberg metadata JSON]); - listing another
    table's exact S3 table prefix ([table prefix]); - and, when write delegation was returned for the crafted
    table, creating and deleting an object under another table's exact S3 table prefix. A control case using
    ordinary different names did not allow the same cross-table access. A least-privilege AWS S3 variant was
    also confirmed in which the attacker principal had no Polaris permissions on the victim table and only the
    minimal permissions required to create and use a crafted wildcard table (namespace-scoped `TABLE_CREATE`
    and `TABLE_WRITE_DATA` on `*`). In that setup, direct Polaris access to `foo.t1` remained forbidden, but
    the attacker could still create and load `*.*`, receive delegated S3 credentials, and use those
    credentials to list, read, create, and delete objects under `foo.t1`. In Iceberg, the metadata JSON file
    is a control file: it tells readers which data files belong to the table, which snapshots exist, and which
    table version to read. So unauthorized access to it is already a meaningful confidentiality problem. The
    confirmed write-capable variant means the issue is not limited to disclosure. (CVE-2026-42810)

ID	Name	Product	Family	Type	Severity
441553	SCA: security update for org.apache.polaris:polaris-core (GHSA-vxgg-mqx2-3w59)	Tenable Cloud Security	SCA Checks	Local	critical
441553	SCA: security update for org.apache.polaris:polaris-core (GHSA-vxgg-mqx2-3w59)	Tenable Self-Hosted Container Security	SCA Checks	Local	critical

Detections

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CVE-2026-42810

critical

Tenable Plugins

critical

critical