{"id":"CVE-2025-2559","url":"https://www.cyber-defence.io/tools/cve/CVE-2025-2559","generatedAt":"2026-10-28T04:34:09.684Z","title":"This issue could result in a denial of service condition, preventing legitimate users from accessing the system.","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.","published":"2025-03-25T09:15:17.000Z","lastModified":"2026-09-21T06:17:00.000Z","status":"Deferred","sourceIdentifier":"secalert@redhat.com","cvss":{"version":"3.1","score":4.9,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H"},"cwe":["CWE-770"],"affected":[],"epss":{"score":0.00703,"percentile":0.5307,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.70%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://access.redhat.com/errata/RHSA-2025:4335","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2025:4336","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/security/cve/CVE-2025-2559","source":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2353868","source":"secalert@redhat.com"},{"url":"https://github.com/keycloak/keycloak/commit/a10c8119d4452b866b90a9019b2cc159919276ca","source":"secalert@redhat.com"},{"url":"https://github.com/keycloak/keycloak/issues/38576","source":"secalert@redhat.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2025-2559","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}