{"cve":"CVE-2017-2646","nvd":{"published":"2018-07-27T18:29:01.017","modified":"2026-06-17T01:16:35.007","status":"Modified","description":"It was found that when Keycloak before 2.5.5 receives a Logout request with a Extensions in the middle of the request, the SAMLSloRequestParser.parse() method ends in a infinite loop. An attacker could use this flaw to conduct denial of service attacks.","cvss_v4":null,"cvss_v3":{"version":"3.0","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-835"],"references":["http://www.securityfocus.com/bid/96882","https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-2646","http://www.securityfocus.com/bid/96882","https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-2646"],"products":["redhat:keycloak"],"source":"nvd","synced_at":"2026-10-19T20:52:03.425131697+00:00"},"epss":{"cve":"CVE-2017-2646","score":0.0183,"percentile":0.78866,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-jc6q-27mw-p55w","url":"https://osv.dev/vulnerability/GHSA-jc6q-27mw-p55w","summary":"Keycloak vulnerable to infinite loop based Denial of Service","modified":"2023-11-08T03:59:19.487959Z","packages":[{"ecosystem":"Maven","name":"org.keycloak:keycloak-core","purl":"pkg:maven/org.keycloak/keycloak-core","ranges":["<2.5.5"],"fixed":["2.5.5"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}