CVE-2026-42083
8.2 HIGHfree5GC is an open-source implementation of the 5G core network
Published: 2026-05-27 · Last updated: 2026-05-28
Severity and scoring
- CVSS
- 8.2 HIGH
- Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
- CWE
- CWE-862
Affected products
| Vendor | Product |
|---|---|
| free5gc | free5gc |
Description
free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, PCF Npcf_SMPolicyControl missing authentication middleware allows unauthenticated access to SM policy handlers and disclosure of subscriber SUPI. In NewServer(), the smPolicyGroup route group is created and routes are applied without attaching the router authorization middleware. In contrast, other PCF service groups such as Npcf_PolicyAuthorization do attach RouterAuthorizationCheck before route registration. Because the middleware is missing, requests to the /npcf-smpolicycontrol/v1/sm-policies, /npcf-smpolicycontrol/v1/sm-policies/{smPolicyId}, /npcf-smpolicycontrol/v1/sm-policies/{smPolicyId}/update, and /npcf-smpolicycontrol/v1/sm-policies/{smPolicyId}/delete endpoints can reach business logic even when no valid OAuth token is provided. This vulnerability is fixed in 4.2.2.
Source: NVD
References
- [NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-42083
- [Exploit reference]https://github.com/free5gc/free5gc/issues/844
- [Vendor advisory]https://github.com/free5gc/free5gc/security/advisories/GHSA-6rgm-gr97-x3j5
- [Patch]https://github.com/free5gc/pcf/commit/8c4d457cdf58bb239ee30e88c56b370b22073964
- [Patch]https://github.com/free5gc/pcf/pull/63
- [Exploit reference]https://github.com/free5gc/free5gc/issues/844
- [Vendor advisory]https://github.com/free5gc/free5gc/security/advisories/GHSA-6rgm-gr97-x3j5
Related CVEs
Same vendor
- CVE-2026-44330 — free5GC is an open-source implementation of the 5G core network (10.0 CRITICAL)
- CVE-2026-44329 — free5GC is an open-source implementation of the 5G core network (10.0 CRITICAL)
- CVE-2026-44328 — free5GC is an open-source implementation of the 5G core network (8.2 HIGH)
- CVE-2026-44327 — free5GC is an open-source implementation of the 5G core network (10.0 CRITICAL)
- CVE-2026-44326 — free5GC is an open-source implementation of the 5G core network (9.4 CRITICAL)
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