CVE-2025-2559 (GCVE-0-2025-2559)

Vulnerability from cvelistv5 – Published: 2025-03-25 08:20 – Updated: 2025-11-20 21:01
VLAI?
Summary
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 ?
4.9 (Medium)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
https://access.redhat.com/errata/RHSA-2025:4335 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2025:4336 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2025-2559 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2353868 issue-trackingx_refsource_REDHAT
Impacted products
Vendor Product Version
Affected: 23.0.0 , < 26.0.11 (semver)
Affected: 26.1.0 , < 26.1.5 (semver)
    Red Hat Red Hat Build of Keycloak     cpe:/a:redhat:build_keycloak:26
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    Red Hat Red Hat build of Keycloak 26.0 Unaffected: 26.0.11-2 , < * (rpm)
    cpe:/a:redhat:build_keycloak:26.0::el9
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    Red Hat Red Hat build of Keycloak 26.0 Unaffected: 26.0-12 , < * (rpm)
    cpe:/a:redhat:build_keycloak:26.0::el9
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    Red Hat Red Hat build of Keycloak 26.0 Unaffected: 26.0-13 , < * (rpm)
    cpe:/a:redhat:build_keycloak:26.0::el9
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    Red Hat Red Hat Single Sign-On 7     cpe:/a:redhat:red_hat_single_sign_on:7
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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