CVE-2026-55866
Description
A flaw was found in SpiceDB, an open-source database system for managing application permissions. Under specific conditions, including concurrent permission checks and an enabled dispatch result cache, the system can incorrectly grant unconditional permission. This vulnerability arises because internal functions responsible for constructing cache keys omit crucial hint information, leading to a cache poisoning scenario. Consequently, an attacker could potentially bypass intended permission caveats and gain unauthorized access.
Statement
Red Hat Product Security has determined that this vulnerability does not affect any currently supported Red Hat product. This assessment may evolve based on further analysis and discovery. For more information about this vulnerability and the products it affects, please see the linked references.
Understanding the Weakness (CWE)
Access Control
Technical Impact: Bypass Protection Mechanism
Access control checks for specific user data or functionality can be bypassed.
Access Control
Technical Impact: Gain Privileges or Assume Identity
Horizontal escalation of privilege is possible (one user can view/modify information of another user).
Access Control
Technical Impact: Gain Privileges or Assume Identity
Vertical escalation of privilege is possible if the user-controlled key is actually a flag that indicates administrator status, allowing the attacker to gain administrative access.
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