CVE-2026-42810

/// Technical description

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

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References