{"cve":"CVE-2026-42459","nvd":{"published":"2026-05-27T17:16:35.593","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, the free5GC UDM component fails to validate the supi path parameter in six GET handlers of the nudm-sdm (Subscriber Data Management) service. An unauthenticated attacker can inject control characters into the SUPI parameter, causing UDM to forward a malformed request to UDR and return a 500 Internal Server Error response that exposes internal infrastructure details. This vulnerability is fixed in 4.2.2.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P","score":7.7},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","score":7.5},"cwes":["CWE-20","CWE-209"],"references":["https://github.com/free5gc/free5gc/security/advisories/GHSA-585v-hcgf-jhfr","https://github.com/free5gc/free5gc/security/advisories/GHSA-585v-hcgf-jhfr"],"products":["free5gc:free5gc"],"source":"nvd","synced_at":"2026-10-19T22:36:28.938604137+00:00"},"epss":{"cve":"CVE-2026-42459","score":0.00324,"percentile":0.25242,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-585v-hcgf-jhfr","url":"https://osv.dev/vulnerability/GHSA-585v-hcgf-jhfr","summary":"Free5GC UDM has Improper Input Validation and Generation of Error Messages Containing Sensitive Information","modified":"2026-06-25T18:56:29.501772193Z","packages":[{"ecosystem":"Go","name":"github.com/free5gc/udm","purl":"pkg:golang/github.com/free5gc/udm","ranges":["<=1.4.3"],"fixed":[]}]},{"id":"GO-2026-5138","url":"https://osv.dev/vulnerability/GO-2026-5138","summary":"Free5GC UDM has Improper Input Validation and Generation of Error Messages Containing Sensitive Information in github.com/free5gc/udm","modified":"2026-06-25T18:45:26.455048296Z","packages":[{"ecosystem":"Go","name":"github.com/free5gc/udm","purl":"pkg:golang/github.com/free5gc/udm","ranges":["all versions"],"fixed":[]}]}],"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."]}