CVE-2025-2559

See a problem?
Please try reporting it to the source first.
Source
https://cve.org/CVERecord?id=CVE-2025-2559
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-2559.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2025-2559
Aliases
Downstream
Published
2025-03-25T08:20:57.666Z
Modified
2026-08-12T14:52:32.918071Z
Severity
  • 4.9 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
Org.keycloak/keycloak-services: jwt token cache exhaustion leading to denial of service (dos) in keycloak
Details

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.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/2xxx/CVE-2025-2559.json",
    "cna_assigner": "redhat",
    "cwe_ids": [
        "CWE-770"
    ]
}
References

Affected packages

Git / github.com/keycloak/keycloak

Affected ranges

Type
GIT
Repo
https://github.com/keycloak/keycloak
Events
Introduced
1d4ce3d8e9dbc9af996f9248996c78e145902a35
Introduced
90f25533be7a7fe2f97e9c0d2040343a8e3e8738
Fixed
7dca54e8dc0dbe23995e260c989c9ef2e9023a94
Fixed
8d6046175da89a45c583821859ddf8ae5dfb4fcd
Fixed
a10c8119d4452b866b90a9019b2cc159919276ca
Database specific
Show details 
{
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ],
    "extracted_events": [
        {
            "introduced": "23.0.0"
        },
        {
            "fixed": "26.0.11"
        },
        {
            "introduced": "26.1.0"
        },
        {
            "fixed": "26.1.5"
        }
    ]
}

Database specific

vanir_signatures 
[
    {
        "signature_type": "Line",
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "99495539601978461797104946757775683432",
                "136582808265309047874801596351273693980",
                "147406706728040871718454698547305497979",
                "325688004905325422922942534192339862550",
                "203646125252265590415965187965001576457",
                "233930968314448263078517150632578458400",
                "87559914693719928603240101130548980776",
                "40269991946593085019937622258852402612",
                "32369642146548667978820170705753519917",
                "297089583331427314864894634166669645187",
                "65539410305777762687259700028662703215",
                "16042915975709791495202969784886719431",
                "137575164655374216848161791086381743061"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2025-2559-4ae39811",
        "target": {
            "file": "services/src/main/java/org/keycloak/authentication/authenticators/client/JWTClientValidator.java"
        },
        "source": "https://github.com/keycloak/keycloak/commit/a10c8119d4452b866b90a9019b2cc159919276ca",
        "signature_version": "v1"
    },
    {
        "signature_type": "Function",
        "deprecated": false,
        "digest": {
            "length": 877.0,
            "function_hash": "46172163112779803195028627278594652112"
        },
        "id": "CVE-2025-2559-605ca17a",
        "target": {
            "function": "validateTokenReuse",
            "file": "services/src/main/java/org/keycloak/authentication/authenticators/client/JWTClientValidator.java"
        },
        "source": "https://github.com/keycloak/keycloak/commit/a10c8119d4452b866b90a9019b2cc159919276ca",
        "signature_version": "v1"
    },
    {
        "signature_type": "Function",
        "deprecated": false,
        "digest": {
            "length": 736.0,
            "function_hash": "43652828651718544592582632549301905351"
        },
        "id": "CVE-2025-2559-818406a3",
        "target": {
            "function": "validateToken",
            "file": "services/src/main/java/org/keycloak/authentication/authenticators/client/JWTClientValidator.java"
        },
        "source": "https://github.com/keycloak/keycloak/commit/a10c8119d4452b866b90a9019b2cc159919276ca",
        "signature_version": "v1"
    },
    {
        "signature_type": "Line",
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "138873874259460242731517666077215121068",
                "307061160018297316716860852342551339080",
                "22563539369615669290211265648088465786"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2025-2559-98df06d3",
        "target": {
            "file": "services/src/main/java/org/keycloak/protocol/oidc/OIDCAdvancedConfigWrapper.java"
        },
        "source": "https://github.com/keycloak/keycloak/commit/a10c8119d4452b866b90a9019b2cc159919276ca",
        "signature_version": "v1"
    },
    {
        "signature_type": "Line",
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "207871681582131381051325541528469796774",
                "232110511063997108434055783295008042299",
                "201215482816556552952895325645540469170",
                "314822569098284525717335466561956758374",
                "324592060811291321952184208692851932791"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2025-2559-bba77e99",
        "target": {
            "file": "testsuite/integration-arquillian/tests/base/src/test/java/org/keycloak/testsuite/oauth/ClientAuthSignedJWTTest.java"
        },
        "source": "https://github.com/keycloak/keycloak/commit/a10c8119d4452b866b90a9019b2cc159919276ca",
        "signature_version": "v1"
    },
    {
        "signature_type": "Line",
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "45562650431411920322004661027263630410",
                "271191974698034486555864630435569802759",
                "185524619692396922334927469650153455199",
                "153765689921600403660252748523739034367"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2025-2559-f0bdf346",
        "target": {
            "file": "server-spi-private/src/main/java/org/keycloak/protocol/oidc/OIDCConfigAttributes.java"
        },
        "source": "https://github.com/keycloak/keycloak/commit/a10c8119d4452b866b90a9019b2cc159919276ca",
        "signature_version": "v1"
    }
]
source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-2559.json"
vanir_signatures_modified 
"2026-08-12T14:52:32Z"