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CVE-2025-2559

Date: March 25, 2025

A flaw was found in Keycloak. When the configuration uses JWT tokens for authentication, the tokens are cached until expiration. If a client uses JWT tokens with an excessively long expiration time, for example, 24 or 48 hours, the cache can grow indefinitely, leading to an OutOfMemoryError. This issue could result in a denial of service condition, preventing legitimate users from accessing the system.

Severity Score

Related Resources (7)

https://access.redhat.com/security/cve/CVE-2025-2559
https://nvd.nist.gov/vuln/detail/CVE-2025-2559
https://bugzilla.redhat.com/show_bug.cgi?id=2353868
https://github.com/keycloak/keycloak
https://access.redhat.com/errata/RHSA-2025:4336
https://access.redhat.com/errata/RHSA-2025:4335
https://www.mend.io/vulnerability-database/CVE-2025-2559

Severity Score

Weakness Type (CWE)

Allocation of Resources Without Limits or Throttling

CWE-770

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): HIGH
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): HIGH

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