Org.keycloak.protocol.oidc: keycloak refresh token reuse bypass via toctou race condition_CVE-2026-1035

{
    "lastseen": "",
    "description": "A flaw was found in the Keycloak server during refresh token processing, specifically in the TokenManager class responsible for enforcing refresh token reuse policies. When strict refresh token rotation is enabled, the validation and update of refresh token usage are not performed atomically. This allows concurrent refresh requests to bypass single-use enforcement and issue multiple access tokens from the same refresh token. As a result, Keycloak\u2019s refresh token rotation hardening can be undermined.",
    "published": "2026-01-21T05:52:22.495Z",
    "modified": "2026-01-21T05:52:22.495Z",
    "type": "cve",
    "title": "Org.keycloak.protocol.oidc: keycloak refresh token reuse bypass via toctou race condition",
    "source": "redhat",
    "references": "https://access.redhat.com/security/cve/CVE-2026-1035\nhttps://bugzilla.redhat.com/show_bug.cgi?id=2430314",
    "id": "CVE-2026-1035",
    "bulletinFamily": "",
    "cwe": [
        "CWE-367"
    ],
    "cvelist": null,
    "sourceData": "",
    "sourceHref": "",
    "cvss": {
        "score": 3.1,
        "severity": "LOW",
        "vector": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N",
        "version": "3.1"
    },
    "cvss2": [],
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        "baseScore": 0,
        "baseSeverity": "",
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        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
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    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Red Hat Build of Keycloak",
    "version": "",
    "vendor": "Red Hat",
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    "ai_score": 0
}