CVE-2026-42811

/// Technical description

In plain terms, Apache Polaris is supposed to issue short-lived GCS credentials

that

only work for one table's files, but a crafted namespace or table name can

cause those credentials to work across the configured bucket instead.

Apache Polaris builds Google Cloud Storage downscoped credentials by creating a

Credential Access Boundary (CAB) with CEL conditions that are intended to

restrict access to the requested table's storage path.

The relevant CEL string is built from the bucket name and the table path.

That

table path is derived from namespace and table identifiers. In current code,

that path appears to be inserted into the CEL expression without escaping.

As a result, a namespace or table identifier containing a single quote and

other URI-safe CEL fragments can break out of the intended quoted string and

change the meaning of the CEL condition.

In private testing against Polaris 1.4.0 on real Google Cloud Storage, it was confirmed that Polaris accepted a crafted identi

/// 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