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CVE-2026-55866 is a low severity vulnerability with a CVSS score of 0.0. No known exploits currently, and patches are available.
Very low probability of exploitation
EPSS predicts the probability of exploitation in the next 30 days based on real-world threat data, complementing CVSS severity scores with actual risk assessment.
Under concurrency, CheckPermission and CheckBulkPermissions can return PERMISSIONSHIP_HAS_PERMISSION for a (resource, permission, subject) whose correct answer is PERMISSIONSHIP_CONDITIONAL_PERMISSION.
You are impacted if all of the following hold:
definition user {}
caveat some_caveat(somecondition int) { somecondition == 42 }
definition document {
relation reader: user | user with some_caveat
relation writer: user
relation banned: user
permission has_permission = (reader & writer) - banned
}
document:firstdoc#reader@user:caveatedreader[some_caveat]
document:firstdoc#writer@user:caveatedreader
LookupResources with a context request parameter, concurrently with CheckPermission/CheckBulkPermissions for the same subject/resource, andWhen all of the above are true, there is an intermittent window in which:
CheckPermission(document:firstdoc, has_permission, user:caveatedreader) → HAS_PERMISSION (incorrect; should be CONDITIONAL_PERMISSION)
CheckPermission(document:firstdoc, has_permission, user:caveatedreader, context = {"somecondition": 41}) → HAS_PERMISSION (incorrect; should be NO_PERMISSION)
v1.54.0
Disable the dispatch result cache (ClusterDispatchCacheConfig and DispatchCacheConfig)
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