{"id":"CVE-2026-4531","summary":"Free5GC AMF handler.go HandleRegistrationComplete denial of service","details":"A weakness has been identified in Free5GC 4.1.0. Affected is the function HandleRegistrationComplete of the file internal/gmm/handler.go of the component AMF. Executing a manipulation can lead to denial of service. The attack may be performed from remote. This patch is called 52e9386401ce56ea773c5aa587d4cdf7d53da799. It is best practice to apply a patch to resolve this issue.","aliases":["GHSA-xq44-64rg-8g3h","GO-2026-5767"],"modified":"2026-09-04T03:31:00.013005461Z","published":"2026-03-22T01:32:11.642Z","related":["openSUSE-SU-2026:21483-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/4xxx/CVE-2026-4531.json","cna_assigner":"VulDB","cwe_ids":["CWE-404"]},"references":[{"type":"WEB","url":"https://github.com/free5gc/free5gc/"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/4xxx/CVE-2026-4531.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-4531"},{"type":"ADVISORY","url":"https://vuldb.com/?id.352319"},{"type":"ADVISORY","url":"https://vuldb.com/?submit.774073"},{"type":"REPORT","url":"https://github.com/free5gc/free5gc/issues/792"},{"type":"REPORT","url":"https://vuldb.com/?ctiid.352319"},{"type":"FIX","url":"https://github.com/free5gc/amf/commit/52e9386401ce56ea773c5aa587d4cdf7d53da799"},{"type":"FIX","url":"https://github.com/free5gc/amf/pull/198"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/free5gc/amf","events":[{"introduced":"0"},{"fixed":"52e9386401ce56ea773c5aa587d4cdf7d53da799"}],"database_specific":{"source":"REFERENCES"}},{"type":"GIT","repo":"https://github.com/free5gc/free5gc","events":[{"introduced":"de6bdb7a0d5963266c893cca59c86f55df348f57"},{"last_affected":"de6bdb7a0d5963266c893cca59c86f55df348f57"}],"database_specific":{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"4.1.0"},{"last_affected":"4.1.0"}]}}],"versions":["4.1.0","v1.4.2","v1.4.1","v1.4.0","v1.3.2","v1.3.1","v1.3.0","v1.2.7","v1.2.6","v1.2.5","v1.2.4","v1.2.3","v1.2.2","v1.2.1","v1.2.0","v1.1.1","v1.1.0","v1.0.2","v1.0.1","v1.0.0","v4.1.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-4531.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X"}]}