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EUVD-2026-308402

fkie_cve-2026-42812

In Apache Iceberg, the table's metadata files are control files: they tell readers which data files belong to the table and which table version to read.

`write.metadata.path` is an optional table property that tells Polaris where to write those metadata files. For a table already registered in a Polaris-managed catalog, changing only that property through an `ALTER TABLE`-style settings change (not a row-level `INSERT`, `SELECT`, `UPDATE`, or `DELETE`) bypasses the commit-time branch that is supposed to revalidate storage locations.

The full persisted / credential-vending variant requires the affected catalog to have `polaris.config.allow.unstructured.table.location=true`, with `allowedLocations` broad enough to include the attacker-chosen target.

`allowedLocations` is the admin-configured allowlist of storage paths that the catalog is allowed to use. Public project materials suggest that this flag is a real supported compatibility / layout mode, not just a contrived lab-only prerequisite.

In that configuration, a user who can change table settings can cause Apache Polaris itself to write new table metadata to an attacker-chosen reachable storage location before the intended location-validation branch runs.

If the later concrete-path validation also accepts that location, Polaris persists the resulting metadata path into stored table state. Later table-load and credential APIs can then return temporary cloud-storage credentials for the same location without revalid…

GHSA-w76p-3cgp-qfcm — Apache Polaris has an Improper Input Validation issue

Affected: Maven: org.apache.polaris:polaris-runtime-service

In Apache Iceberg, the table's metadata files are control files: they tell readers which data files belong to the table and which table version to read.