Vulnerability · Published Sep 14, 2026 · Assigned by GitHub_M

CVE-2026-55866SpiceDBChecks involving relations with caveats can result in unconditional permission when conditional permission is expected

Low 3.7

In plain English

A low-severity incorrect authorization in spicedb from authzed. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 28% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)3.7Low

Exploit odds (30 days)0.3%top 72.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	github.com/authzed/spicedb	1.54.0	GHSA-4vrg-r928-h5vv
Go	github.com/authzed/spicedb	1.54.0	GO-2026-5133

Affected products (as reported)

Vendor	Product	Versions
authzed	spicedb	>= 1.34.1, < 1.54.0

Weakness: CWE-863 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

References

https://github.com/authzed/spicedb/security/advisories/GHSA-4vrg-r928-h5vv x_refsource_CONFIRM
https://github.com/authzed/spicedb/pull/3188 x_refsource_MISC
https://github.com/authzed/spicedb/commit/44a1c9f266bd8a884bfebfc27181210302541b9b x_refsource_MISC
https://github.com/authzed/spicedb/commit/ccde792fc48750740d025d4286d5c2c88614cd30 x_refsource_MISC
https://github.com/authzed/spicedb/releases/tag/v1.54.0 x_refsource_MISC