CVE-2026-64640: Apache Polaris: register endpoint reads attacker-controlled storage location before allowed-locations validation

[Alexandre Dutra <adutra () apache org>]

Severity: low 

Affected versions:

- Apache Polaris (org.apache.polaris:polaris-runtime-service) through 1.6.0

Description:

Apache Polaris did not consistently validate storage locations supplied during table and view registration.

An authenticated principal with permission to register a table or view could, depending on the affected release and 
registration path, cause Polaris to use the catalog's storage credentials to read a caller-selected Iceberg metadata 
file before verifying that the file was within the catalog's allowed storage locations.

If the catalog's underlying credentials could read an object outside that boundary, this could disclose limited 
information from the object.


Polaris could also accept registration metadata located within an allowed location that contained references to storage 
locations outside the allowed boundary.

This second condition did not itself cause Polaris to read the referenced external locations during registration.


The demonstrated impact is limited to confidentiality.

No unauthorized data modification or availability impact has been demonstrated.


The server-side read requires a deployment using S3 credential vending and an object outside the allowed locations that 
the catalog's underlying storage credentials can read.

Exploitation requires an authenticated principal with table- or view-registration privileges.

Credit:

Andrea Cosentino (finder)

References:

https://polaris.apache.org
https://www.cve.org/CVERecord?id=CVE-2026-64640