CVE-2026-18212

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An unauthenticated attacker can exploit this by sending repeated malformed SAML requests, leading to native memory exhaustion and a denial of service."}], "id": "CVE-2026-18212", "lastModified": "2026-09-16T19:42:43.623", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "secalert@redhat.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-18212", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-09-16T18:25:11.882582Z", "version": "2.0.3"}}]}, "published": "2026-09-16T15:17:33.257", "references": [{"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:68276"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:68277"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:68278"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:68280"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/security/cve/CVE-2026-18212"}, {"source": "secalert@redhat.com", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2508307"}], "sourceIdentifier": "secalert@redhat.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-401"}], "source": "secalert@redhat.com", "type": "Secondary"}]}

{"acknowledgement": "Red Hat would like to thank Paul Bottinelli (Trail of Bits in collaboration with OpenAI) for reporting this issue.", "affected_release": [{"advisory": "RHSA-2026:68276", "cpe": "cpe:/a:redhat:build_keycloak:26.4::el9", "package": "rhbk/keycloak-operator-bundle:26.4.16-2", "product_name": "Red Hat build of Keycloak 26.4", "release_date": "2026-09-16T00:00:00Z"}, {"advisory": "RHSA-2026:68276", "cpe": "cpe:/a:redhat:build_keycloak:26.4::el9", "package": "rhbk/keycloak-rhel9:26.4-26", "product_name": "Red Hat build of Keycloak 26.4", "release_date": "2026-09-16T00:00:00Z"}, {"advisory": "RHSA-2026:68276", "cpe": "cpe:/a:redhat:build_keycloak:26.4::el9", "package": "rhbk/keycloak-rhel9-operator:26.4-26", "product_name": "Red Hat build of Keycloak 26.4", "release_date": "2026-09-16T00:00:00Z"}, {"advisory": "RHSA-2026:68280", "cpe": "cpe:/a:redhat:build_keycloak:26.4::el9", "package": "keycloak-services", "product_name": "Red Hat build of Keycloak 26.4.16", "release_date": "2026-09-16T00:00:00Z"}, {"advisory": "RHSA-2026:68280", "cpe": "cpe:/a:redhat:build_keycloak:26.4::el9", "package": "rhbk-openshift-rhel9/rhbk-openshift-rhel9", "product_name": "Red Hat build of Keycloak 26.4.16", "release_date": "2026-09-16T00:00:00Z"}, {"advisory": "RHSA-2026:68277", "cpe": "cpe:/a:redhat:build_keycloak:26.6::el9", "package": "rhbk/keycloak-operator-bundle:26.6.7-3", "product_name": "Red Hat build of Keycloak 26.6", "release_date": "2026-09-16T00:00:00Z"}, {"advisory": "RHSA-2026:68277", "cpe": "cpe:/a:redhat:build_keycloak:26.6::el9", "package": "rhbk/keycloak-rhel9:26.6-20", "product_name": "Red Hat build of Keycloak 26.6", "release_date": "2026-09-16T00:00:00Z"}, {"advisory": "RHSA-2026:68277", "cpe": "cpe:/a:redhat:build_keycloak:26.6::el9", "package": "rhbk/keycloak-rhel9-operator:26.6-20", "product_name": "Red Hat build of Keycloak 26.6", "release_date": "2026-09-16T00:00:00Z"}, {"advisory": "RHSA-2026:68278", "cpe": "cpe:/a:redhat:build_keycloak:26.6::el9", "package": "keycloak-services", "product_name": "Red Hat build of Keycloak 26.6.7", "release_date": "2026-09-16T00:00:00Z"}, {"advisory": "RHSA-2026:68278", "cpe": "cpe:/a:redhat:build_keycloak:26.6::el9", "package": "rhbk-keycloak-rhel9/rhbk-keycloak-rhel9", "product_name": "Red Hat build of Keycloak 26.6.7", "release_date": "2026-09-16T00:00:00Z"}, {"advisory": "RHSA-2026:68278", "cpe": "cpe:/a:redhat:build_keycloak:26.6::el9", "package": "rhbk-openshift-rhel9/rhbk-openshift-rhel9", "product_name": "Red Hat build of Keycloak 26.6.7", "release_date": "2026-09-16T00:00:00Z"}], "bugzilla": {"description": "keycloak-services: keycloak-services: SAML Redirect DEFLATE helpers leak native zlib state", "id": "2508307", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2508307"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "verified"}, "cwe": "CWE-401", "details": ["A flaw was found in the SAML Redirect Binding implementation of Keycloak, an open-source identity and access management solution. The issue occurs because the custom DEFLATE compression and decompression helpers fail to release native zlib memory after use. An unauthenticated attacker can exploit this by sending repeated malformed SAML requests, leading to native memory exhaustion and a denial of service."], "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-2026-18212", "package_state": [{"cpe": "cpe:/a:redhat:jboss_data_grid:8", "fix_state": "Affected", "package_name": "keycloak-services", "product_name": "Red Hat Data Grid 8"}, {"cpe": "cpe:/a:redhat:jbosseapxp", "fix_state": "Not affected", "package_name": "keycloak-services", "product_name": "Red Hat JBoss Enterprise Application Platform Expansion Pack"}, {"cpe": "cpe:/a:redhat:red_hat_single_sign_on:7", "fix_state": "Affected", "package_name": "keycloak-services", "product_name": "Red Hat Single Sign-On 7"}], "public_date": "2026-09-16T12:57:23Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-18212\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-18212"], "statement": "The Red Hat Product Security team has assessed the severity of this vulnerability as Important, given that it can be exploited by a remote, unauthenticated attacker. Successful exploitation allows an attacker to cause a complete denial of service by exhausting the native memory of the Keycloak process. The vulnerability root cause is the failure to explicitly release native zlib resources in the SAML DEFLATE helper classes.", "threat_severity": "Important"}

{"created": "2026-09-18T00:30:16.966965+00:00", "updated": "2026-09-18T00:30:16.966970+00:00", "vendors": []}