CVE-2025-2559
Org.keycloak/keycloak-services: jwt token cache exhaustion leading to denial of service (dos) in keycloak
Severity Score
4.9
*CVSS v3.1
Exploit Likelihood
*EPSS
Affected Versions
*CPE
Public Exploits
0
*Multiple Sources
Exploited in Wild
-
*KEV
Decision
Track
*SSVC
Descriptions
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.
New images are available for Red Hat build of Keycloak 26.0.11 and Red Hat build of Keycloak 26.0.11 Operator, running on OpenShift Container Platform. Issues addressed include bypass and denial of service vulnerabilities.
*Credits:
N/A
CVSS Scores
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Attack Vector
Attack Complexity
Authentication
Confidentiality
Integrity
Availability
* Common Vulnerability Scoring System
SSVC
- Decision:Track
Exploitation
Automatable
Tech. Impact
* Organization's Worst-case Scenario
Timeline
- 2025-03-20 CVE Reserved
- 2025-03-25 CVE Published
- 2025-04-30 CVE Updated
- 2025-04-30 EPSS Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
- CWE-770: Allocation of Resources Without Limits or Throttling
CAPEC
References (4)
| URL | Tag | Source |
|---|
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2025-2559 | 2025-03-25 | |
| https://bugzilla.redhat.com/show_bug.cgi?id=2353868 | 2025-03-25 | |
| https://access.redhat.com/errata/RHSA-2025:4335 | 2025-04-30 | |
| https://access.redhat.com/errata/RHSA-2025:4336 | 2025-04-30 |
Affected Vendors, Products, and Versions
| Vendor | Product | Version | Other | Status | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
| Redhat Search vendor "Redhat" | Build Keycloak Search vendor "Redhat" for product "Build Keycloak" | * | - |
Affected
| ||||||
| Redhat Search vendor "Redhat" | Build Of Keycloak Search vendor "Redhat" for product "Build Of Keycloak" | * | - |
Affected
| ||||||
| Redhat Search vendor "Redhat" | Red Hat Single Sign On Search vendor "Redhat" for product "Red Hat Single Sign On" | * | - |
Affected
| ||||||