CVE-2026-42082 json
free5GC: Missing Concurrent NAS SMC Validation During NGAP Handover
published 2026-05-07 6 mo ago modified 2026-10-14 25 d ago also EUVD-2026-32556 , GHSA-vrrx-58h3-prmh , GO-2026-5673
- cvss
- 3.7
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 16%
- public exploits
- 0
- none known
Summary
free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, the AMF in Free5GC does not enforce the concurrent security procedure rules defined in 3GPP TS 33.501 §6.9.5.1. The AMF does not check for ongoing N2 handover procedures before initiating a NAS Security Mode Command, and vice versa. This can lead to mismatches between NAS and AS security contexts in the network and the UE. This vulnerability is fixed in 4.2.2.
Patch / fix
- free5gc free5gc 4.2.2
- free5gc smf 4.2.2
- free5gc upf 4.2.2
- govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
opensuse advisories openSUSE-SU-2026:21483-1
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- partial
- Assessed
- 5 mo ago
Exploit prediction
0.25% chance of exploitation in the next 30 days, higher than 16% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/free5gc/free5gc/security/advisories/GHSA-vrrx-58h3-prmh referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 3.7 | CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:L |
| GitHub | 3.1 | 3.7 | CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:L |
| NVD | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | github.com/free5gc/amf | <=1.4.3 all versions |
no fix listed |
Affected products
- free5gc free5gc
Classification
- Weakness
-
- CWE-358 Improperly Implemented Security Check for Standard
References
-
github.com
/free5gc/free5gc/security/advisories/GHSA-vrrx-58h3-prmh
exploit, web, vendor-advisory, advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-42082
advisory
-
github.com
/free5gc/amf/blame/v1.4.3/internal/gmm/sm.go
web
-
github.com
/free5gc/amf/blame/v1.4.3/internal/ngap/handler.go
web
-
github.com
/free5gc/free5gc
package
Sources
- CVE List CVE-2026-42082
- GitHub Advisory GHSA-vrrx-58h3-prmh
- NVD CVE-2026-42082
- OSV GO-2026-5673
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.