Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
AV AC PR UI S C I A CVSS EPSS %ile KEV A L N N U N L H 7.1 .0027 18.9 —
AFFECTED Product Versions Fixed free5gc < 4.2.2 – —
TIMELINE Apr 23 Reserved by GitHub_M May 27 EXPLOIT PUBLISHED — CVE-2026-42081 (free5gc). Public exploit reference added. May 27 Published (CNA: GitHub_M)
free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, the AMF in Free5GC does not verify the UE Security Capabilities received in NGAP PathSwitchRequest messages against its locally stored values, as mandated by 3GPP TS 33.501 §6.7.3.1. A malicious gNB can overwrite the AMF's stored UE security capabilities with arbitrary values, which are then propagated in PathSwitchRequest Acknowledge messages and subsequent Handover Request messages. This leads to persistent handover denial-of-service for affected UEs. This vulnerability is fixed in 4.2.2.
| Date | Event | Detail |
|---|---|---|
| April 23, 2026 | Reserved | Reserved by GitHub_M |
| May 27, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2026-42081 (free5gc). Public exploit reference added. |
| May 27, 2026 | Published | Published (CNA: GitHub_M) |
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|---|---|---|---|
| free5gc | free5gc | — | < 4.2.2 | — |
Authoritative record: CVE-2026-42081 at cve.org
Vendors: free5gc
Weaknesses: CWE-358
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-42081 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.