https://cve.radiocsirt.org/rss/recent/all/10 Most recent entries from all 2026-10-08T21:37:41.410160+00:00 Vulnerability-Lookup csirt@opendfir.org python-feedgen Contains only the most 10 recent entries. https://cve.radiocsirt.org/vuln/euvd-2026-322218 EUVD-2026-322218 2026-10-08T21:37:41.413518+00:00 EUVD-2026-322218 https://cve.radiocsirt.org/vuln/fkie_cve-2026-42081 fkie_cve-2026-42081 2026-10-08T21:37:41.413551+00:00

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.

 https://cve.radiocsirt.org/vuln/ghsa-77x9-rf64-92gv GHSA-77x9-rf64-92gv — Free5GC AMF Bypasses UE Security Capabilities on NGAP PathSwitchRequest 2026-10-08T21:37:41.413585+00:00

Affected: Go: github.com/free5gc/amf

### Summary The AMF in Free5GC v4.2.1 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.

### Details **Affected File:** `amf/internal/ngap/handler.go` — `handlePathSwitchRequestMain` function

**Root Cause:**

When the AMF receives a PathSwitchRequest during an Xn-handover, it processes the UESecurityCapabilities IE by directly overwriting the stored values without comparing them to the previously stored capabilities:

```go if uESecurityCapabilities != nil { amfUe.UESecurityCapability.SetEA1_128_5G(uESecurityCapabilities.NRencryptionAlgorithms.Value.Bytes[0] & 0x80) amfUe.UESecurityCapability.SetEA2_128_5G(uESecurityCapabilities.NRencryptionAlgorithms.Value.Bytes[0] & 0x40) amfUe.UESecurityCapability.SetEA3_128_5G(uESecurityCapabilities.NRencryptionAlgorithms.Value.Bytes[0] & 0x20) amfUe.UESecurityCapability.SetIA1_128_5G(uESecurityCapabilities.NRintegrityProtectionAlgorithms.Value.Bytes[0] & 0x80) amfUe.UESecurityCapability.SetIA2_128_5G(uESecurityCapabilities.NRintegrityProtectionAlgorithms.Value.Bytes[0] & 0x40) amfUe.UESecurityCapability.SetIA3_128_5G(uESecurityCap…