{"answers":{"affected":"3 open source packages ship an affected version, including org.keycloak:keycloak-services and keycloak. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-4634 in the wild and no public exploit code.","fix":"Upgrade org.keycloak:keycloak-services to 26.5.7 or later.","what":"CVE-2026-4634 is a high-severity denial of service vulnerability in Redhat Build of Keycloak, published on 2 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-4634 and fix it if it is affected.\n\nWhat it is: CVE-2026-4634 is a high-severity denial of service vulnerability in Redhat Build of Keycloak, published on 2 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-4634 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- org.keycloak:keycloak-services (Maven): affected all versions; fixed in 26.5.7\n- org.keycloak:keycloak-services (Maven): affected all versions; fixed in 26.5.7\n- keycloak (Bitnami): affected from 26.2.0; fixed in 26.2.1, 26.3.0, 26.4.1, 26.5.0\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-4634/ (Markdown: https://insights.sbomify.com/CVE-2026-4634/index.md)","id":"CVE-2026-4634","markdown":"https://insights.sbomify.com/CVE-2026-4634/index.md","name":"CVE-2026-4634","record":{"aliases":["BIT-keycloak-2026-4634","ECHO-5745-1868-1f70","GHSA-h4wv-g838-66g3","MINI-p6f6-m593-g9m8","MINI-r7hv-4mc7-v5jm"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Keycloak identity server","requires_auth":"none","summary":"An unauthenticated attacker can cause a Denial of Service on Keycloak by sending a specially crafted POST request with an excessively long scope parameter.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"redhat","cpe":[{"product":"build_of_keycloak","vendor":"redhat"}],"cvss":{"score":7.5,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-1050","name":"Excessive Platform Resource Consumption within a Loop"}],"description":"A flaw was found in Keycloak. An unauthenticated attacker can exploit this vulnerability by sending a specially crafted POST request with an excessively long scope parameter to the OpenID Connect (OIDC) token endpoint. This leads to high resource consumption and prolonged processing times, ultimately resulting in a Denial of Service (DoS) for the Keycloak server.","ecosystems":["Bitnami","Maven"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Keycloak: keycloak: denial of service via excessive processing of openid connect scope parameters","id":"CVE-2026-4634","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Bitnami","product":"redhat:build_of_keycloak","products":["redhat:build_of_keycloak"],"type":"denial_of_service","year":"2026"},"n_packages":3,"n_references":11,"next":{"headline":"Persistent notification timing attack causing server denial of service","id":"CVE-2026-4635"},"packages":[{"ecosystem":"Bitnami","fixed":["26.2.1","26.3.0","26.4.1","26.5.0"],"introduced":["26.2.0","26.2.15","26.4.0","26.4.11"],"last_affected":[],"package":"keycloak","purl":"pkg:bitnami/keycloak","source":"BIT-keycloak-2026-4634"},{"ecosystem":"Maven","fixed":["26.5.7"],"introduced":["0"],"last_affected":[],"package":"org.keycloak:keycloak-services","purl":null,"source":"GHSA-h4wv-g838-66g3"},{"ecosystem":"Maven","fixed":["26.5.7"],"introduced":["0"],"last_affected":[],"package":"org.keycloak:keycloak-services","purl":"pkg:maven/org.keycloak/keycloak-services","source":"GHSA-h4wv-g838-66g3"}],"prev":{"headline":"Keycloak: keycloak: user enumeration via differential error messages","id":"CVE-2026-4633"},"products":["RHEL-8 based Middleware Containers","Red Hat Single Sign-On 7.6 for RHEL 7","Red Hat Single Sign-On 7.6 for RHEL 8","Red Hat Single Sign-On 7.6 for RHEL 9","Red Hat Single Sign-On 7.6.13","Red Hat build of Keycloak 26.2","Red Hat build of Keycloak 26.2.15","Red Hat build of Keycloak 26.4","Red Hat build of Keycloak 26.4.11"],"published":"2026-04-02","related":[{"cvss_score":8.8,"headline":"Keycloak-services: keycloak-services: dcr protocol mapper type-swap policy bypass allows privilege escalation","id":"CVE-2026-15572","kev_date_added":null,"published":"2026-08-05"},{"cvss_score":8.8,"headline":"Keycloak SAML Broken has Authentication Bypass by Primary Weakness","id":"CVE-2026-3047","kev_date_added":null,"published":"2026-03-05"},{"cvss_score":8.1,"headline":"Keycloak-services: keycloak-services: authorization bypass via unnormalized uri matching in pathmatcher","id":"CVE-2026-15573","kev_date_added":null,"published":"2026-08-05"},{"cvss_score":8.1,"headline":"Keycloak-services: keycloak-services: default dcr policy allows role forgery via user property mappers","id":"CVE-2026-16102","kev_date_added":null,"published":"2026-08-05"},{"cvss_score":8.1,"headline":"Org.keycloak/keycloak-quarkus-server: keycloak: unauthorized access via jwt authorization grant with disabled users","id":"CVE-2026-1609","kev_date_added":null,"published":"2026-07-16"},{"cvss_score":8.1,"headline":"Org.keycloak:keycloak-services: keycloak: authentication bypass via jwt algorithm confusion","id":"CVE-2026-11800","kev_date_added":null,"published":"2026-06-25"},{"cvss_score":8.1,"headline":"Keycloak-policy-enforcer: keycloak policy enforcer: authorization bypass via incorrect uri comparison","id":"CVE-2026-9800","kev_date_added":null,"published":"2026-06-25"}],"sources":[{"class":"attribution","licence":"Apache-2.0","name":"Bitnami","prefix":"BIT"},{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-10-06","vendors":["Red Hat"]},"summary":"An unauthenticated attacker can cause a Denial of Service on Keycloak by sending a specially crafted POST request with an excessively long scope parameter.","url":"https://insights.sbomify.com/CVE-2026-4634/"}