{"id":"CVE-2026-55866","aliases":["GHSA-4vrg-r928-h5vv","GO-2026-5133"],"url":"https://o3.security/vulnerability/CVE-2026-55866","summary":"SpiceDBChecks involving relations with caveats can result in unconditional permission when conditional permission is expected","details":"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.","published":"2026-09-14T17:23:56.428Z","modified":"2026-09-16T03:47:06.396724180Z","cvss":{"score":3.7,"severity":"LOW","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Go","name":"github.com/authzed/spicedb","fixedVersion":"1.54.0"}],"fix":{"url":"https://github.com/authzed/spicedb/commit/44a1c9f266bd8a884bfebfc27181210302541b9b","label":"authzed/spicedb@44a1c9f"},"references":[{"type":"WEB","url":"https://github.com/authzed/spicedb/releases/tag/v1.54.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55866.json"},{"type":"ADVISORY","url":"https://github.com/authzed/spicedb/security/advisories/GHSA-4vrg-r928-h5vv"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55866"},{"type":"FIX","url":"https://github.com/authzed/spicedb/commit/44a1c9f266bd8a884bfebfc27181210302541b9b"},{"type":"FIX","url":"https://github.com/authzed/spicedb/commit/ccde792fc48750740d025d4286d5c2c88614cd30"},{"type":"FIX","url":"https://github.com/authzed/spicedb/pull/3188"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-16T03:47:06.396724180Z"}}