# CVE-2026-55866

## Summary

- **CVE ID:** CVE-2026-55866
- **Severity:** LOW
- **CVSS Score:** 3.7 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N)
- **CWE:** CWE-863
- **Published:** Sep 14, 2026
- **Last Modified:** Sep 14, 2026

## Description

SpiceDB is an open source database system for creating and managing security-critical application permissions. From 1.34.0 until 1.54.0, SpiceDB can return PERMISSIONSHIP_HAS_PERMISSION instead of PERMISSIONSHIP_CONDITIONAL_PERMISSION or PERMISSIONSHIP_NO_PERMISSION because checkRequestToKey() and checkRequestToKeyWithCanonical() in internal/dispatch/keys/computed.go omit CheckHints when constructing dispatch Check cache keys. The incorrect result requires a permission combining relations with intersection or exclusion, a subject reachable through caveated and non-caveated branches, LookupResources with a context parameter running concurrently with CheckPermission or CheckBulkPermissions for the same resource and subject, and an enabled dispatch result cache. Under these conditions, a result computed for one hint set can poison the cache entry used by a semantically different authorization check, allowing permission without satisfying the caveat. This issue is fixed in version 1.54.0.

## Affected Products

- authzed — spicedb (>= 1.34.1, < 1.54.0)

## References

- [CNA](https://github.com/authzed/spicedb/security/advisories/GHSA-4vrg-r928-h5vv)
- [CNA](https://github.com/authzed/spicedb/pull/3188)
- [CNA](https://github.com/authzed/spicedb/commit/44a1c9f266bd8a884bfebfc27181210302541b9b)
- [CNA](https://github.com/authzed/spicedb/commit/ccde792fc48750740d025d4286d5c2c88614cd30)
- [CNA](https://github.com/authzed/spicedb/releases/tag/v1.54.0)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.22%
- **EPSS Percentile:** 12.7

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-19._