{"id":"CVE-2026-33065","aliases":["GHSA-958m-gxmc-mccm","GO-2026-4758"],"url":"https://o3.security/vulnerability/CVE-2026-33065","summary":"free5GC UDM incorrectly returns 500 for empty supi path parameter in DELETE sdm-subscriptions request","details":"Free5GC is an open-source Linux Foundation project for 5th generation (5G) mobile core networks. In versions prior to 1.4.2, the UDM incorrectly converts a downstream 400 Bad Request (from UDR) into a 500 Internal Server Error when handling DELETE requests with an empty supi path parameter. This leaks internal error handling behavior and makes it difficult for clients to distinguish between client-side errors and server-side failures. When a client sends a DELETE request with an empty supi (e.g., double slashes // in URL path), the UDM forwards the malformed request to UDR, which correctly returns 400. However, UDM propagates this as 500 SYSTEM_FAILURE instead of returning the appropriate 400 error to the client. This violates REST API best practices for DELETE operations. The issue has been patched in version 1.4.2.","published":"2026-03-20T08:03:39.357Z","modified":"2026-08-12T03:51:41.676363969Z","cvss":null,"epss":{"score":0.00282,"percentile":0.2018,"asOf":"2026-08-24"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/free5gc/udm","fixedVersion":"1.4.2"}],"fix":{"url":"https://github.com/free5gc/udm/commit/88de9fa74a1b3f3522e53b4cfa2d184712ffa4ee","label":"free5gc/udm@88de9fa"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33065.json"},{"type":"ADVISORY","url":"https://github.com/free5gc/free5gc/security/advisories/GHSA-958m-gxmc-mccm"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33065"},{"type":"REPORT","url":"https://github.com/free5gc/free5gc/issues/783"},{"type":"FIX","url":"https://github.com/free5gc/udm/commit/88de9fa74a1b3f3522e53b4cfa2d184712ffa4ee"},{"type":"FIX","url":"https://github.com/free5gc/udm/pull/79"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:41.676363969Z"}}