CVE-2026-44325

free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, free5GC's NRF root SBI endpoint POST /oauth2/token contains a parser-level type-confusion bug family. The handler in NFs/nrf/internal/sbi/api_accesstoken.go reflects over models.NrfAccessTokenAccessTokenReq, special-cases only plain string and NrfNfManagementNfType fields, and treats every other field as if it were a single models.PlmnId. The parsed *models.PlmnId is then assigned with reflect.Value.Set() to whichever field name the attacker put in the form body, which panics whenever the destination field's real type is incompatible (slice, different struct, primitive). Gin recovery converts each panic into HTTP 500, but the endpoint remains remotely panicable from a single unauthenticated form-encoded request and is repeatedly triggerable. This vulnerability is fixed in 4.2.2.

• CWE-20
• CWE-755
• CWE-843

• https://github.com/free5gc/free5gc/issues/918Exploit, Issue Tracking
• https://github.com/free5gc/free5gc/security/advisories/GHSA-f8qv-7x5w-qr48Exploit, Vendor Advisory
• https://github.com/free5gc/nrf/commit/f7bc77daa7425506af7569f2e61c2a210f5a0423Patch
• https://github.com/free5gc/nrf/pull/83Issue Tracking, Patch
• https://github.com/free5gc/free5gc/security/advisories/GHSA-f8qv-7x5w-qr48Exploit, Vendor Advisory

Published

May 27, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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