rhsa-2025:4336
Vulnerability from csaf_redhat
Published
2025-04-29 22:53
Modified
2025-08-18 16:03
Summary
Red Hat Security Advisory: Red Hat build of Keycloak 26.0.11 Update

Notes

Topic
New Red Hat build of Keycloak 26.0.11 packages are available from the Customer Portal
Details
Red Hat build of Keycloak 26.0.11 is a standalone server, based on the Keycloak project, that provides authentication and standards-based single sign-on capabilities for web and mobile applications. Security fixes: * JWT Token Cache Exhaustion Leading to Denial of Service (DoS) in Keycloak * Keycloak hostname verification * Two factor authentication bypass
Terms of Use
This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.


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{
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      "text": "Important"
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    "distribution": {
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    "lang": "en",
    "notes": [
      {
        "category": "summary",
        "text": "New Red Hat build of Keycloak 26.0.11 packages are available from the Customer Portal",
        "title": "Topic"
      },
      {
        "category": "general",
        "text": "Red Hat build of Keycloak 26.0.11 is a standalone server, based on the Keycloak project, that provides authentication and standards-based single sign-on capabilities for web and mobile applications.\n\nSecurity fixes:\n* JWT Token Cache Exhaustion Leading to Denial of Service (DoS) in Keycloak\n* Keycloak hostname verification\n* Two factor authentication bypass",
        "title": "Details"
      },
      {
        "category": "legal_disclaimer",
        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.",
        "title": "Terms of Use"
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    ],
    "title": "Red Hat Security Advisory: Red Hat build of Keycloak 26.0.11 Update",
    "tracking": {
      "current_release_date": "2025-08-18T16:03:54+00:00",
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      "revision_history": [
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          "summary": "Initial version"
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        {
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  "vulnerabilities": [
    {
      "cve": "CVE-2025-2559",
      "cwe": {
        "id": "CWE-770",
        "name": "Allocation of Resources Without Limits or Throttling"
      },
      "discovery_date": "2025-03-20T11:46:08.046000+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2353868"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "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.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "org.keycloak/keycloak-services: JWT Token Cache Exhaustion Leading to Denial of Service (DoS) in Keycloak",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Within regulated environments, a combination of the following controls acts as a significant barrier to successfully exploiting a CWE-770: Allocation of Resources Without Limits or Throttling vulnerability and therefore downgrades the severity of this particular CVE from Moderate to Low.\n\nThe platform enforces hardening guidelines to apply the most restrictive settings required for operations, while baseline configurations maintain secure system and software states. A defense-in-depth monitoring strategy includes perimeter firewalls and endpoint protection services that detect excessive resource usage caused by malicious activity or system misconfigurations. In the event of exploitation, process isolation ensures workloads operate in separate environments, preventing any single process from overconsuming CPU or memory and degrading system performance.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
        "fixed": [
          "Red Hat Build of Keycloak"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2025-2559"
        },
        {
          "category": "external",
          "summary": "RHBZ#2353868",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2353868"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2025-2559",
          "url": "https://www.cve.org/CVERecord?id=CVE-2025-2559"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-2559",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-2559"
        }
      ],
      "release_date": "2025-03-20T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2025-04-29T22:53:23+00:00",
          "details": "Before applying the update, back up your existing installation, including all applications, configuration files, databases and database settings, and so on.",
          "product_ids": [
            "Red Hat Build of Keycloak"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2025:4336"
        }
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      "scores": [
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            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 4.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "HIGH",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "Red Hat Build of Keycloak"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "org.keycloak/keycloak-services: JWT Token Cache Exhaustion Leading to Denial of Service (DoS) in Keycloak"
    },
    {
      "cve": "CVE-2025-3501",
      "cwe": {
        "id": "CWE-297",
        "name": "Improper Validation of Certificate with Host Mismatch"
      },
      "discovery_date": "2025-04-10T12:24:28.784000+00:00",
      "ids": [
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          "text": "2358834"
        }
      ],
      "notes": [
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          "category": "description",
          "text": "A flaw was found in Keycloak. By setting a verification policy to \u0027ALL\u0027, the trust store certificate verification is skipped, which is unintended.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "org.keycloak.protocol.services: Keycloak hostname verification",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Red Hat has rated this as an Important severity, although this configuration is not recommended, especially in production environments.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
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        ]
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          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2025-3501"
        },
        {
          "category": "external",
          "summary": "RHBZ#2358834",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2358834"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2025-3501",
          "url": "https://www.cve.org/CVERecord?id=CVE-2025-3501"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-3501",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-3501"
        },
        {
          "category": "external",
          "summary": "https://github.com/keycloak/keycloak/issues/39350",
          "url": "https://github.com/keycloak/keycloak/issues/39350"
        },
        {
          "category": "external",
          "summary": "https://github.com/keycloak/keycloak/pull/39366",
          "url": "https://github.com/keycloak/keycloak/pull/39366"
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      ],
      "release_date": "2025-04-29T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2025-04-29T22:53:23+00:00",
          "details": "Before applying the update, back up your existing installation, including all applications, configuration files, databases and database settings, and so on.",
          "product_ids": [
            "Red Hat Build of Keycloak"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2025:4336"
        },
        {
          "category": "workaround",
          "details": "Use the correct TLS configuration and avoid using \"--tls-hostname-verifier=any\".",
          "product_ids": [
            "Red Hat Build of Keycloak"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 8.2,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N",
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      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "org.keycloak.protocol.services: Keycloak hostname verification"
    },
    {
      "acknowledgments": [
        {
          "names": [
            "Marek Posolda"
          ],
          "organization": "Red Hat",
          "summary": "This issue was discovered by Red Hat."
        }
      ],
      "cve": "CVE-2025-3910",
      "cwe": {
        "id": "CWE-287",
        "name": "Improper Authentication"
      },
      "discovery_date": "2025-04-23T19:23:26.537000+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2361923"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in Keycloak. The org.keycloak.authorization package may be vulnerable to circumventing required actions, allowing users to circumvent requirements such as setting up two-factor authentication.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "org.keycloak.authentication: Two factor authentication bypass",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Within regulated environments, a combination of the following controls acts as a significant barrier to successfully exploiting a CWE-287: Improper Authentication vulnerability and therefore downgrades the severity of this particular CVE from Moderate to Low.\n\nAccess to the platform is granted only after successful authentication through multifactor authentication (MFA). Domain accounts are configured to lock out based on predefined access policies reducing the effectiveness of brute-force attacks on authentication mechanisms. The platform employs IAM roles for identification and authentication within its cloud infrastructure that govern user access to resources and manage provisioning, deployment, and configuration within the platform environment. This reduces the risk of unauthorized access through third-party or external user accounts. Finally, memory protection mechanisms are used to enhance resilience against unauthorized commands or improper authentication.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
        "fixed": [
          "Red Hat Build of Keycloak"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2025-3910"
        },
        {
          "category": "external",
          "summary": "RHBZ#2361923",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2361923"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2025-3910",
          "url": "https://www.cve.org/CVERecord?id=CVE-2025-3910"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-3910",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-3910"
        },
        {
          "category": "external",
          "summary": "https://github.com/keycloak/keycloak/issues/39349",
          "url": "https://github.com/keycloak/keycloak/issues/39349"
        }
      ],
      "release_date": "2025-04-29T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2025-04-29T22:53:23+00:00",
          "details": "Before applying the update, back up your existing installation, including all applications, configuration files, databases and database settings, and so on.",
          "product_ids": [
            "Red Hat Build of Keycloak"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2025:4336"
        },
        {
          "category": "workaround",
          "details": "No current mitigations are available for this vulnerability.",
          "product_ids": [
            "Red Hat Build of Keycloak"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.4,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N",
            "version": "3.1"
          },
          "products": [
            "Red Hat Build of Keycloak"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "org.keycloak.authentication: Two factor authentication bypass"
    }
  ]
}


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