CVE-2025-2559
This issue could result in a denial of service condition, preventing legitimate users from accessing the system.
Does this matter?
Lower severity and a low EPSS score (0.70%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 4.9 MEDIUMCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.70% probability · 53th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-770
- Source
- secalert@redhat.com
EPSS 0.7% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://access.redhat.com/errata/RHSA-2025:4335
- https://access.redhat.com/errata/RHSA-2025:4336
- https://access.redhat.com/security/cve/CVE-2025-2559
- https://bugzilla.redhat.com/show_bug.cgi?id=2353868
- https://github.com/keycloak/keycloak/commit/a10c8119d4452b866b90a9019b2cc159919276ca
- https://github.com/keycloak/keycloak/issues/38576
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.