Vulnerabilities in pkg:golang/github.com/authzed/spicedb

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-4vrg-r928-h5vv",
  "modified" : "2026-06-19T21:42:12Z",
  "published" : "2026-06-19T21:42:12Z",
  "aliases" : [ "CVE-2026-55866" ],
  "summary" : "SpiceDB: Checks involving relations with caveats can result in unconditional permission when conditional permission is expected",
  "details" : "### Impact\n Under concurrency, `CheckPermission` and `CheckBulkPermissions` can return `PERMISSIONSHIP_HAS_PERMISSION` for a (resource, permission, subject) whose correct answer is   `PERMISSIONSHIP_CONDITIONAL_PERMISSION`. \n\n You are impacted if **all** of the following hold:\n\n  1. Your schema has a permission combining relations with an intersection or exclusion, where a subject reaches it through a caveated branch and a non-caveated branch. For example:\n\n```zed\n  definition user {}\n\n  caveat some_caveat(somecondition int) { somecondition == 42 }\n\n  definition document {\n    relation reader: user | user with some_caveat\n    relation writer: user\n    relation banned: user\n    permission has_permission = (reader & writer) - banned\n  }\n```\n\n  2. A subject reaches the permission via the caveated edge:\n\n```\n  document:firstdoc#reader@user:caveatedreader[some_caveat]\n  document:firstdoc#writer@user:caveatedreader\n```\n  3. Your workload issues `LookupResources` with a `context` request parameter, concurrently with `CheckPermission/CheckBulkPermissions` for the same subject/resource, and\n  4. The dispatch result cache is enabled.\n  \nWhen all of the above are true, there is an intermittent window in which:\n\n`CheckPermission(document:firstdoc, has_permission, user:caveatedreader)` → HAS_PERMISSION (incorrect; should be CONDITIONAL_PERMISSION)\n\n`CheckPermission(document:firstdoc, has_permission, user:caveatedreader, context = {\"somecondition\": 41})` → HAS_PERMISSION (incorrect; should be NO_PERMISSION)\n\n### Patches\n\nv1.54.0\n\n### Workarounds\nDisable the dispatch result cache (`ClusterDispatchCacheConfig` and `DispatchCacheConfig`)",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/authzed/spicedb"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "1.34.0"
      }, {
        "fixed" : "1.54.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/authzed/spicedb/security/advisories/GHSA-4vrg-r928-h5vv"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/authzed/spicedb"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-863" ],
    "severity" : "LOW",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-06-19T21:42:12Z",
    "nvd_published_at" : null
  }
}