LookupResources Cursor section tampering can crash SpiceDB process via tuple.MustParse panic

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## Description A malformed or tampered-with LookupResources [Cursor token](https://buf.build/authzed/api/docs/main:authzed.api.v1#authzed.api.v1.Cursor) can cause a panic in the SpiceDB process if it fails to parse. If an attacker were able to make requests to a SpiceDB instance, they could affect its availability. ## Reproduction If one was to take a cursor from a LookupResources call, decode it according to the logic that SpiceDB uses, and modify the Sections field to include an invalid relationship string, the process will panic. ## Impact An attacker would need both the ability to create a gRPC connection to your SpiceDB instance and a valid token, or else the ability to pass a cursor token from outside your application through to your SpiceDB instance. If an attacker had this ability, they could bring down SpiceDB instances, reducing the availability of SpiceDB and any service that depends on it. ## Mechanism The SpiceDB process does not validate the contents of this `Sections` component of the `Cursor` message. In affected versions, it uses a parsing function that calls `panic` if the value cannot be parsed as a relationship. ## Fix This issue was fixed in https://github.com/authzed/spicedb/pull/2878. ## Remediations * Prevent client control of the `optional_cursor` field in `LookupResources` calls * Upgrade to an unaffected version

Source published

6 Feb 2026 22:30:52 UTC

Source modified

10 Sep 2026 03:50:35 UTC

Saved here

24 Oct 2026 13:19:41 UTC

Source terms

GitHub Advisory Database · CC-BY-4.0

Original source record · Cite this exact observation · Complete original publisher JSON

Source: osv · GitHub Advisory Database · CC-BY-4.0. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS_V4 · CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U

Publisher rating · LOW

LookupResources Cursor section tampering can crash SpiceDB process via tuple.MustParse panic in github.com/authzed/spicedb. NOTE: The source advisory for this report contains additional versions that could not be automatically mapped to standard Go module versions. (If this is causing false-positive reports from vulnerability scanners, please suggest an edit to the report.) The additional affected modules and versions are: .

Source published

17 Feb 2026 18:09:06 UTC

Source modified

19 Feb 2026 20:41:26 UTC

Saved here

24 Oct 2026 13:19:41 UTC

Source terms

OSV · upstream source license applies

Original source record · Cite this exact observation · Complete original publisher JSON

Source: osv · OSV · upstream source license applies. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.