{"id":"CVE-2026-4531","state":"PUBLISHED","title":"Free5GC AMF handler.go HandleRegistrationComplete denial of service","description":"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.","publishedAt":"2026-03-22T01:32:11.642Z","updatedAt":"2026-03-23T15:34:56.907Z","severity":{"score":6.9,"label":"Medium","version":"4.0","vector":"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","source":"VulDB"},"assigner":"VulDB","products":["n/a Free5GC"],"affected":[{"vendor":"n/a","product":"Free5GC","versions":[{"version":"4.1.0","status":"affected"}],"cpes":["cpe:2.3:a:free5gc:free5gc:*:*:*:*:*:*:*:*"],"modules":["AMF"]}],"references":["https://vuldb.com/?id.352319","https://vuldb.com/?ctiid.352319","https://vuldb.com/?submit.774073","https://github.com/free5gc/free5gc/issues/792","https://github.com/free5gc/amf/pull/198","https://github.com/free5gc/amf/commit/52e9386401ce56ea773c5aa587d4cdf7d53da799","https://github.com/free5gc/free5gc/"],"weaknesses":["CWE-404"],"ingestedAt":"2026-10-29T20:12:16.098Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/4xxx/CVE-2026-4531.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-4531","state":"PUBLISHED","datePublished":"2026-03-22T01:32:11.642Z","dateUpdated":"2026-03-23T15:34:56.907Z","assignerShortName":"VulDB","assignerOrgId":"1af790b2-7ee1-4545-860a-a788eba489b5","dateReserved":"2026-03-21T07:47:21.184Z"},"containers":{"cna":{"title":"Free5GC AMF handler.go HandleRegistrationComplete denial of service","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"n/a","product":"Free5GC","versions":[{"version":"4.1.0","status":"affected"}],"cpes":["cpe:2.3:a:free5gc:free5gc:*:*:*:*:*:*:*:*"],"modules":["AMF"]}],"references":[{"url":"https://vuldb.com/?id.352319","name":"VDB-352319 | Free5GC AMF handler.go HandleRegistrationComplete denial of service","tags":["vdb-entry","technical-description"]},{"url":"https://vuldb.com/?ctiid.352319","name":"VDB-352319 | CTI Indicators (IOB, IOC, TTP, IOA)","tags":["signature","permissions-required"]},{"url":"https://vuldb.com/?submit.774073","name":"Submit #774073 | Linux Foundation free5GC 4.1.0 Denial of Service","tags":["third-party-advisory"]},{"url":"https://github.com/free5gc/free5gc/issues/792","tags":["issue-tracking"]},{"url":"https://github.com/free5gc/amf/pull/198","tags":["issue-tracking","patch"]},{"url":"https://github.com/free5gc/amf/commit/52e9386401ce56ea773c5aa587d4cdf7d53da799","tags":["patch"]},{"url":"https://github.com/free5gc/free5gc/","tags":["product"]}],"metrics":[{"cvssV4_0":{"version":"4.0","baseScore":6.9,"vectorString":"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","baseSeverity":"MEDIUM"}},{"cvssV3_1":{"version":"3.1","baseScore":5.3,"vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:X/RL:O/RC:C","baseSeverity":"MEDIUM"}},{"cvssV3_0":{"version":"3.0","baseScore":5.3,"vectorString":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:X/RL:O/RC:C","baseSeverity":"MEDIUM"}},{"cvssV2_0":{"version":"2.0","baseScore":5,"vectorString":"AV:N/AC:L/Au:N/C:N/I:N/A:P/E:ND/RL:OF/RC:C"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-404","type":"CWE","lang":"en","description":"Denial of Service"}]}],"providerMetadata":{"shortName":"VulDB","orgId":"1af790b2-7ee1-4545-860a-a788eba489b5","dateUpdated":"2026-03-22T01:32:11.642Z"},"timeline":[{"time":"2026-03-21T00:00:00.000Z","lang":"en","value":"Advisory disclosed"},{"time":"2026-03-21T01:00:00.000Z","lang":"en","value":"VulDB entry created"},{"time":"2026-03-21T08:52:25.000Z","lang":"en","value":"VulDB entry last update"}],"credits":[{"lang":"en","value":"shovon0203 (VulDB User)","type":"reporter"}],"tags":["x_open-source"]},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/free5gc/free5gc/issues/792","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-03-23T15:34:51.047653Z","id":"CVE-2026-4531","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-03-23T15:34:56.907Z"}}]}}}