Bug 2533228 (CVE-2026-55866)

Summary: CVE-2026-55866 github.com/authzed/spicedb: SpiceDB: Unauthorized access due to cache poisoning in permission checks
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: low    
Version: unspecifiedCC: kaycoth
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in SpiceDB, an open-source database system for managing application permissions. Under specific conditions, including concurrent permission checks and an enabled dispatch result cache, the system can incorrectly grant unconditional permission. This vulnerability arises because internal functions responsible for constructing cache keys omit crucial hint information, leading to a cache poisoning scenario. Consequently, an attacker could potentially bypass intended permission caveats and gain unauthorized access.
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Description OSIDB Bzimport 2026-09-14 17:32:39 UTC 
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.