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This content was generated utilizing AI tools in conjunction with data from https://cmetaxonomy.org. Customers are advised to independently evaluate and test these temporary mitigations within their own infrastructure.\n\nThe highest-value action is to enforce XML payload size and element count validation during SAML SOAP request parsing before DOM tree construction: upgrade to Red Hat build of Keycloak 26.4.17, 26.6.8 (or the corresponding fixed Red Hat builds), which enforce XML payload size and element count limits when parsing incoming SAML SOAP requests, closing all 2 injection vectors (SAML Artifact Resolution SOAP requests with large or deeply nested XML payloads, SAML ECP SOAP requests containing millions of empty XML elements). 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The SAML Artifact Resolution and ECP SOAP endpoints do not properly limit the size or complexity of incoming XML requests. An unauthenticated remote attacker can exploit this by sending specially crafted, large XML messages that cause the server to consume excessive memory. 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{"bugzilla": {"description": "keycloak-services: keycloak-services: Unauthenticated Denial of Service via SAML SOAP endpoint unbounded XML parsing", "id": "2526302", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2526302"}, "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": "draft"}, "cwe": "CWE-400", "details": ["A flaw was found in the SAML implementation of Keycloak, an open-source identity and access management solution. The SAML Artifact Resolution and ECP SOAP endpoints do not properly limit the size or complexity of incoming XML requests. An unauthenticated remote attacker can exploit this by sending specially crafted, large XML messages that cause the server to consume excessive memory. This leads to the application running out of memory and crashing, resulting in a denial of service for all users."], "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-2026-82965", "package_state": [{"cpe": "cpe:/a:redhat:build_keycloak:", "fix_state": "Affected", "package_name": "keycloak/rhbk-openshift-rhel9", "product_name": "Red Hat Build of Keycloak"}, {"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": "Will not fix", "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-2026-82965\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-82965"], "statement": "The Red Hat Product Security team has assessed the severity of this vulnerability as Important, given that it can be exploited by an unauthenticated remote attacker. Successful exploitation allows an attacker to cause a complete denial of service by crashing the Keycloak process. The vulnerability's root cause is the lack of proper size and element count validation for XML payloads processed by the SAML SOAP endpoints.", "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": null}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Red Hat Build of Keycloak", "source": "cna", "vendor": "Red Hat"}, "product": "red_hat_build_of_keycloak_26.4", "vendor": "red_hat"}, {"configurations": [{"platform": null, "status": "affected", "versions": null}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Red Hat Build of Keycloak", "source": "cna", "vendor": "Red Hat"}, "product": "build_of_keycloak", "vendor": "redhat"}, {"configurations": [{"platform": null, "status": "affected", "versions": null}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Red Hat Single Sign-On 7", "source": "cna", "vendor": "Red Hat"}, "product": "single_sign-on", "vendor": "redhat"}], "created": "2026-11-05T19:00:20.008211+00:00", "updated": "2026-11-06T04:15:11.940625+00:00", "vendors": ["red_hat", "red_hat$PRODUCT$red_hat_build_of_keycloak_26.4", "redhat", "redhat$PRODUCT$build_of_keycloak", "redhat$PRODUCT$single_sign-on"]}