{"cve":"CVE-2026-42083","nvd":{"published":"2026-05-27T17:16:35.327","modified":"2026-10-14T20:10:00.190","status":"Analyzed","description":"free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, PCF Npcf_SMPolicyControl missing authentication middleware allows unauthenticated access to SM policy handlers and disclosure of subscriber SUPI. In NewServer(), the smPolicyGroup route group is created and routes are applied without attaching the router authorization middleware. In contrast, other PCF service groups such as Npcf_PolicyAuthorization do attach RouterAuthorizationCheck before route registration. Because the middleware is missing, requests to the  /npcf-smpolicycontrol/v1/sm-policies, /npcf-smpolicycontrol/v1/sm-policies/{smPolicyId}, /npcf-smpolicycontrol/v1/sm-policies/{smPolicyId}/update, and /npcf-smpolicycontrol/v1/sm-policies/{smPolicyId}/delete endpoints can reach business logic even when no valid OAuth token is provided. This vulnerability is fixed in 4.2.2.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N","score":8.2},"cwes":["CWE-862"],"references":["https://github.com/free5gc/free5gc/issues/844","https://github.com/free5gc/free5gc/security/advisories/GHSA-6rgm-gr97-x3j5","https://github.com/free5gc/pcf/commit/8c4d457cdf58bb239ee30e88c56b370b22073964","https://github.com/free5gc/pcf/pull/63","https://github.com/free5gc/free5gc/issues/844"],"products":["free5gc:free5gc"],"source":"nvd","synced_at":"2026-10-19T22:36:28.938604137+00:00"},"epss":{"cve":"CVE-2026-42083","score":0.00323,"percentile":0.25149,"date":"2026-10-26"},"kev":null,"osv":[{"id":"GHSA-6rgm-gr97-x3j5","url":"https://osv.dev/vulnerability/GHSA-6rgm-gr97-x3j5","summary":"Free5GC PCF: Missing authentication middleware in Npcf_SMPolicyControl allows access to SM policy handlers and disclosure of subscriber SUPI","modified":"2026-06-25T19:56:20.321015396Z","packages":[{"ecosystem":"Go","name":"github.com/free5gc/pcf","purl":"pkg:golang/github.com/free5gc/pcf","ranges":["<1.4.3"],"fixed":["1.4.3"]}]},{"id":"GO-2026-5189","url":"https://osv.dev/vulnerability/GO-2026-5189","summary":"Free5GC PCF: Missing authentication middleware in Npcf_SMPolicyControl allows access to SM policy handlers and disclosure of subscriber SUPI in github.com/free5gc/pcf","modified":"2026-06-25T19:45:12.872090562Z","packages":[{"ecosystem":"Go","name":"github.com/free5gc/pcf","purl":"pkg:golang/github.com/free5gc/pcf","ranges":["<1.4.3"],"fixed":["1.4.3"]}]}],"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."]}