CVE-2026-64640 Apache Polaris: register endpoint reads attacker-controlled storage location before allowed-locations validation
Authenticated users can bypass storage location validation to read unauthorized Iceberg metadata files via the register endpoint.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-64640?
CVE-2026-64640 is a medium-severity missing authorization vulnerability in Apache Polaris, published on 6 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-863
Which versions are affected by CVE-2026-64640?
1 open source package ship an affected version, including apache-polaris. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
apache-polaris PyPI | All versions | 1.7.0 |
Products include Apache Polaris.
How do I fix CVE-2026-64640?
Upgrade apache-polaris to 1.7.0 or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-64640 being exploited?
There is no known exploitation of CVE-2026-64640 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Other vulnerabilities in Apache Polaris
- CVE-2026-42809 Apache Polaris: staged table creation could vend storage credentials for unvalidated locations
- CVE-2026-42810 Apache Polaris: could broaden vended S3 credentials through wildcard-bearing namespace or table names
- CVE-2026-42811 Apache Polaris has an Improper Input Validation issue
- CVE-2026-42812 Apache Polaris: No protection on `write.metadata.path`
Sources
Also known as GHSA-62q9-5g2h-5gxp, MINI-67hp-c4vr-542x, MINI-7h5v-q44v-vvx6, MINI-7vm2-cg86-f77q, MINI-fm65-hggj-v5j2, PYSEC-2026-3623.