{"id":"CVE-2026-42459","title":"free5GC is an open-source implementation of the 5G core network","summary":"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 unauthentic…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","cwe":["CWE-20","CWE-209"],"vendor":"free5gc","product":"free5gc","affected":["free5gc < 4.2.2"],"patched":["free5gc 4.2.2"],"published":"2026-05-27","updated":"2026-10-14","sourceUpdated":"2026-10-14T20:10:00.190","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-42459","references":[{"url":"https://github.com/free5gc/free5gc/security/advisories/GHSA-585v-hcgf-jhfr","label":"security-advisories@github.com"},{"url":"https://github.com/free5gc/free5gc/security/advisories/GHSA-585v-hcgf-jhfr","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd"],"epss":0.00448,"epssPercentile":0.37391,"ingestedAt":"2026-10-14T20:53:12.328Z","slug":"CVE-2026-42459","body":"## Overview\n\nfree5GC 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.\n\n## Affected\n\n- `free5gc < 4.2.2`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `free5gc 4.2.2`","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}