{"schema_version":"1.7.5","id":"GHSA-4jrw-92fg-4jwx","published":"2026-03-18T20:06:14Z","modified":"2026-03-23T18:55:58.711681Z","aliases":["CVE-2026-33063","GO-2026-4754"],"summary":"free5GC AUSF UE Authentication Panic on Nil SuciSupiMap Interface Conversion","details":"**Impact**  \nThis is an Improper Null Check vulnerability leading to Denial of Service.  \n- **Security Impact**: A remote attacker can cause the AUSF service to panic and crash by sending a crafted UE authentication request that triggers a nil interface conversion in the `GetSupiFromSuciSupiMap` function. This results in complete denial of service for the AUSF authentication service.  \n- **Functional Impact**: The `GetSupiFromSuciSupiMap` function attempts to perform an interface conversion from `interface{}` to `*context.SuciSupiMap` without checking if the underlying value is nil. When `SuciSupiMap` is nil, the code panics with \"interface conversion: interface {} is nil, not *context.SuciSupiMap\".  \n- **Affected Parties**: All deployments of free5GC v4.0.1 using the AUSF UE authentication service (`/nausf-auth/v1/ue-authentications` endpoint).\n\n**Patches**  \nYes, the issue has been patched.  \nThe fix is implemented in PR free5gc/ausf#52 (commit: [add specific commit hash if available]).  \nUsers should upgrade to the next release of free5GC that includes this commit.\n\n**Workarounds**  \nThere is no direct workaround at the application level. The recommendation is to apply the provided patch or restrict access to the AUSF API to trusted sources only.","affected":[{"package":{"name":"github.com/free5gc/ausf","ecosystem":"Go","purl":"pkg:golang/github.com/free5gc/ausf"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.4.2"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-4jrw-92fg-4jwx/GHSA-4jrw-92fg-4jwx.json"}}],"references":[{"type":"WEB","url":"https://github.com/free5gc/free5gc/security/advisories/GHSA-4jrw-92fg-4jwx"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33063"},{"type":"WEB","url":"https://github.com/free5gc/free5gc/issues/778"},{"type":"WEB","url":"https://github.com/free5gc/ausf/pull/52"},{"type":"WEB","url":"https://github.com/free5gc/ausf/commit/3b9ac4403c2756dc89a5ed3cdcefe688458588aa"},{"type":"PACKAGE","url":"https://github.com/free5gc/free5gc"}],"database_specific":{"cwe_ids":["CWE-476"],"github_reviewed":true,"github_reviewed_at":"2026-03-18T20:06:14Z","nvd_published_at":"2026-03-20T03:16:01Z","severity":"HIGH"},"severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"}]}