{"id":"CVE-2026-55866","sourceIdentifier":"security-advisories@github.com","published":"2026-09-14T18:17:56.150","lastModified":"2026-09-30T19:38:27.293","vulnStatus":"Awaiting Analysis","cveTags":[],"descriptions":[{"lang":"en","value":"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":[{"source":"security-advisories@github.com","affectedData":[{"vendor":"authzed","product":"spicedb","versions":[{"version":">= 1.34.1, < 1.54.0","status":"affected"}]}]}],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","baseScore":3.7,"baseSeverity":"LOW","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"LOW","availabilityImpact":"NONE"},"exploitabilityScore":2.2,"impactScore":1.4}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-09-14T18:15:32.043031Z","id":"CVE-2026-55866","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-863"}]}],"references":[{"url":"https://github.com/authzed/spicedb/commit/44a1c9f266bd8a884bfebfc27181210302541b9b","source":"security-advisories@github.com"},{"url":"https://github.com/authzed/spicedb/commit/ccde792fc48750740d025d4286d5c2c88614cd30","source":"security-advisories@github.com"},{"url":"https://github.com/authzed/spicedb/pull/3188","source":"security-advisories@github.com"},{"url":"https://github.com/authzed/spicedb/releases/tag/v1.54.0","source":"security-advisories@github.com"},{"url":"https://github.com/authzed/spicedb/security/advisories/GHSA-4vrg-r928-h5vv","source":"security-advisories@github.com"}]}