CVE-2025-64529 SpiceDB's WriteRelationships fails silently if payload is too big
Attackers can bypass authorization checks in SpiceDB by triggering silent failures in relationship writes under specific high-volume configurations.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-64529?
CVE-2025-64529 is a low-severity vulnerability in authzed spicedb, published on 10 Nov 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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`.
Weakness: CWE-770
Which versions are affected by CVE-2025-64529?
3 open source packages ship an affected version, including github.com/authzed/spicedb. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/authzed/spicedb Go | All versions | 1.45.2 |
github.com/authzed/spicedb Go | All versions | 1.45.2 |
github.com/authzed/spicedb Go | All versions | 1.45.2 |
Products include Authzed Spicedb.
How do I fix CVE-2025-64529?
Upgrade github.com/authzed/spicedb to 1.45.2 or later.
Is CVE-2025-64529 being exploited?
There is no known exploitation of CVE-2025-64529 in the wild and no public exploit code.
Other vulnerabilities in authzed spicedb
- CVE-2023-29193 SpiceDB binding metrics port to untrusted networks and can leak command-line flags
- CVE-2022-21646 Lookup operations do not take into account wildcards in SpiceDB
- CVE-2024-27101 Integer overflow in chunking helper causes dispatching to miss elements or panic
- CVE-2026-40091 SpiceDB: SPICEDB_DATASTORE_CONN_URI is leaked on startup logs
- CVE-2023-46255 `SPICEDB_DATASTORE_CONN_URI` is leaked when URI cannot be parsed
Sources
Also known as GHSA-pm3x-jrhh-qcr7, GO-2025-4120.