authzed spicedb up to 1.45.1 allocation of resources

Summaryinfo

A vulnerability, which was classified as critical, has been found in authzed spicedb up to 1.45.1. Impacted is an unknown function. The manipulation leads to allocation of resources. This vulnerability is uniquely identified as CVE-2025-64529. The attack is possible to be carried out remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in authzed spicedb up to 1.45.1. This issue affects an unknown functionality. The manipulation with an unknown input leads to a allocation of resources vulnerability. Using CWE to declare the problem leads to CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. Impacted is integrity, and availability. The summary by CVE is:

SpiceDB is an open source database system for creating and managing security-critical application permissions. In versions prior to 1.45.2, users who use the exclusion operator somewhere in their authorization schema; have configured their SpiceDB server such that `--write-relationships-max-updates-per-call` is bigger than 6500; and issue calls to WriteRelationships with a large enough number of updates that cause the payload to be bigger than what their datastore allows; will receive a successful response from their `WriteRelationships` call, when in reality that call failed, and receive incorrect permission check results, if those relationships had to be read to resolve the relation involving the exclusion. Version 1.45.2 contains a patch for the issue. As a workaround, set `--write-relationships-max-updates-per-call` to `1000`.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2025-64529 since 11/05/2025. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

Upgrading to version 1.45.2 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2025-50833). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

• authzed

Name

• spicedb

Version

• 1.45.0
• 1.45.1

Website

• Product: https://github.com/authzed/spicedb/

CPE 2.3info

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CPE 2.2info

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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