CVE-2025-2559
Medium
Description
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.
SeverityMedium
CVSS4.9
Exploit probability—
ProductOrg.keycloak:keycloak-services
PublishedMar 25, 2025
First seenMar 25, 2025
Weakness typeCWE-770Allocation of resources without limits
How to fix
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| org.keycloak:keycloak-servicesMaven | v ≤ 26.1.4 | — |
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