{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-109081", "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "state": "PUBLISHED", "assignerShortName": "redhat", "dateReserved": "2026-10-12T05:43:18.181Z", "datePublished": "2026-11-06T05:57:29.220Z", "dateUpdated": "2026-11-06T10:28:26.584Z"}, "containers": {"cna": {"title": "Keycloak-services: keycloak-services: injection of roles into realm default-roles via dcr endpoint", "metrics": [{"other": {"content": {"value": "Moderate", "namespace": "https://access.redhat.com/security/updates/classification/"}, "type": "Red Hat severity rating"}}, {"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 6.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "HIGH", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H", "version": "3.1"}, "format": "CVSS"}], "descriptions": [{"lang": "en", "value": "A flaw was found in Keycloak. The Dynamic Client Registration (DCR) endpoint does not properly validate authorization when processing the deprecated defaultRoles field. An authenticated attacker with client creation privileges or an Initial Access Token (IAT) can inject excessive roles into the realm's default roles configuration. This causes clients across the realm to generate bloated access tokens, resulting in performance and memory degradation that can lead to a Denial of Service (DoS)."}], "affected": [{"vendor": "Red Hat", "product": "Red Hat build of Keycloak 26.6.8", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected", "packageName": "keycloak-services", "cpes": ["cpe:/a:redhat:build_keycloak:26.6::el9"]}, {"vendor": "Red Hat", "product": "Red Hat build of Keycloak 26.6.8", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected", "packageName": "rhbk/keycloak-rhel9", "cpes": ["cpe:/a:redhat:build_keycloak:26.6::el9"]}, {"vendor": "Red Hat", "product": "Red Hat Single Sign-On 7", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "keycloak-services", "defaultStatus": "unaffected", "cpes": ["cpe:/a:redhat:red_hat_single_sign_on:7"]}], "references": [{"url": "https://access.redhat.com/errata/RHSA-2026:95761", "name": "RHSA-2026:95761", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/security/cve/CVE-2026-109081", "tags": ["vdb-entry", "x_refsource_REDHAT"]}], "datePublic": "2026-11-05T00:00:00.000Z", "problemTypes": [{"descriptions": [{"cweId": "CWE-862", "description": "Missing Authorization", "lang": "en", "type": "CWE"}]}], "x_redhatCweChain": "CWE-862: Missing Authorization", "workarounds": [{"lang": "en", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability."}], "timeline": [{"lang": "en", "time": "2026-10-09T18:28:55.000Z", "value": "Reported to Red Hat."}, {"lang": "en", "time": "2026-11-05T00:00:00.000Z", "value": "Made public."}], "providerMetadata": {"orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "shortName": "redhat", "dateUpdated": "2026-11-06T10:28:26.584Z"}, "x_generator": {"engine": "cvelib 1.8.0"}}}}

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{"affected": [{"affectedData": [{"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/a:redhat:build_keycloak:26.6::el9"], "defaultStatus": "unaffected", "packageName": "keycloak-services", "product": "Red Hat build of Keycloak 26.6.8", "vendor": "Red Hat"}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/a:redhat:build_keycloak:26.6::el9"], "defaultStatus": "unaffected", "packageName": "rhbk/keycloak-rhel9", "product": "Red Hat build of Keycloak 26.6.8", "vendor": "Red Hat"}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/a:redhat:red_hat_single_sign_on:7"], "defaultStatus": "unaffected", "packageName": "keycloak-services", "product": "Red Hat Single Sign-On 7", "vendor": "Red Hat"}], "source": "secalert@redhat.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "A flaw was found in Keycloak. The Dynamic Client Registration (DCR) endpoint does not properly validate authorization when processing the deprecated defaultRoles field. An authenticated attacker with client creation privileges or an Initial Access Token (IAT) can inject excessive roles into the realm's default roles configuration. This causes clients across the realm to generate bloated access tokens, resulting in performance and memory degradation that can lead to a Denial of Service (DoS)."}], "id": "CVE-2026-109081", "lastModified": "2026-11-06T11:17:03.837", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 6.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "HIGH", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.3, "impactScore": 4.0, "source": "secalert@redhat.com", "type": "Secondary"}]}, "published": "2026-11-06T06:16:39.290", "references": [{"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:95761"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/security/cve/CVE-2026-109081"}], "sourceIdentifier": "secalert@redhat.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-862"}], "source": "secalert@redhat.com", "type": "Secondary"}]}

{"csaw": false, "cvss3": {"cvss3_base_score": "6.8", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-862", "details": ["A flaw was found in Keycloak. The Dynamic Client Registration (DCR) endpoint does not properly validate authorization when processing the deprecated defaultRoles field. An authenticated attacker with client creation privileges or an Initial Access Token (IAT) can inject excessive roles into the realm's default roles configuration. This causes clients across the realm to generate bloated access tokens, resulting in performance and memory degradation that can lead to a Denial of Service (DoS)."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability."}, "name": "CVE-2026-109081", "package_state": [{"cpe": "cpe:/a:redhat:build_keycloak:", "fix_state": "Affected", "package_name": "keycloak-services", "product_name": "Red Hat Build of Keycloak"}, {"cpe": "cpe:/a:redhat:build_keycloak:", "fix_state": "Affected", "package_name": "rhbk/keycloak-rhel9", "product_name": "Red Hat Build of Keycloak"}, {"cpe": "cpe:/a:redhat:red_hat_single_sign_on:7", "fix_state": "Not affected", "package_name": "keycloak-services", "product_name": "Red Hat Single Sign-On 7"}], "public_date": "2026-11-05T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-109081\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-109081"], "statement": "The Red Hat Product Security team has rated this vulnerability as Moderate severity. An attacker needs high privileges to exploit it: either the create-client realm-management role or an Initial Access Token issued by an administrator. The flaw exists because the Dynamic Client Registration endpoint doesn't properly check authorization when it processes the deprecated defaultRoles field. This lets an attacker add a large number of roles to the realm's default-roles composite. As a result, every client with full scope allowed (the default setting) gets bloated access tokens, which causes performance and memory problems across the realm. The main impact is on availability. This flaw doesn't directly give anyone unauthorized access to protected resources.", "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": null}], "enrichment": {"confidence": 85.0, "confidence_source": "inferred", "scores": [{"score": 85.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "product": "keycloak", "vendor": "keycloak"}], "created": "2026-11-06T02:45:06.882100+00:00", "title": "Denial of Service via Default Role Injection in Keycloak DCR", "updated": "2026-11-06T03:00:16.824814+00:00", "vendors": ["keycloak", "keycloak$PRODUCT$keycloak"]}