SpiceDB WriteRelationships fails silently if payload is too big — CVE-2025-64529

Summary

### Impact Users who 1. use the exclusion operator somewhere in their authorization schema 1. have configured their SpiceDB server such that `--write-relationships-max-updates-per-call` is bigger than 6500 1. issue calls to WriteRelationships with a large enough number of updates that cause the payload to be bigger than what their datastore allows will 1. receive a successful response from their…

Product

go: github.com/authzed/spicedb

What to do

General, cautious steps (verify details in the official source):

• Review exposure and plan remediation based on risk and environment.
• Identify affected product versions in your inventory and verify whether you are impacted.
• Apply vendor patches/updates or recommended mitigations as soon as available.
• Read the official advisory for exact affected versions and remediation steps.

Official advisory

• Read the official source
• CVE Record
• NVD

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