CVE-2026-44328
HighSummary
In versions prior to 4.2.2, free5GC's SMF mounts the UPI management route group without inbound OAuth2 middleware. As a result, an unauthenticated DELETE /upi/v1/upNodesLinks/gNB1 request crashes the handler with a nil-pointer panic and mutates the in-memory user-plane topology.
Risk Assessment
An off-path network attacker can exploit this vulnerability to trigger a denial-of-service (DoS) and alter the system state, potentially disrupting the operation of the 5G network.
Recommendation
It is recommended to upgrade to version 4.2.2 or later to eliminate this vulnerability and secure the system against unauthorized access.
Other vulnerabilities in free5GC
See all- CVE-2026-30073Unknown
A vulnerability in the NssaiAvailabilitySubscriptionCreate component of free5gc v4.0.1 allows an attacker to cause a Denial of Service (DoS) via a crafted POST request.
- CVE-2026-30072Unknown
A NULL pointer dereference in the CDR processing path of free5gc v4.0.1 allows attackers to cause a Denial of Service (DoS) by supplying a crafted payload.
- CVE-2026-30071Unknown
An issue in the RechargePut function of free5gc v4.0.1 allows attackers to cause a Denial of Service (DoS) via crafted input.
- CVE-2026-30070Unknown
An issue in the HandleGetSharedData function of free5gc v4.0.1 allows attackers to cause a Denial of Service (DoS) via crafted input.
- CVE-2026-30069Unknown
A NULL pointer dereference in the UDMC registration handler component of free5gc v4.0.1 allows attackers to cause a Denial of Service (DoS) by supplying a crafted payload.
- CVE-2026-30068Unknown
Improper input validation in the HandleUpdate function (/sbi/parameter_provision.go) of free5gc v4.0.1 allows attackers to cause a Denial of Service (DoS) via crafted input.
- CVE-2026-30067Unknown
An issue in the complexQueryFilterSubprocess function in the NRF Discovery service of free5gc v4.0.1 allows attackers to cause a Denial of Service (DoS) via crafted input.
- CVE-2026-30064Unknown
Improper input validation in the buildFilter function (processor/processor.go) of free5gc v4.0.1 allows attackers to cause a Denial of Service (DoS) via crafted input.
- CVE-2026-30063Unknown
An issue in the NF Discovery endpoint of free5gc v4.0.1 allows attackers to cause a Denial of Service (DoS) via a crafted snssais query.
- CVE-2026-30060Unknown
An issue in free5gc v4.0.1 allows attackers to cause a Denial of Service (DoS) when parsing crafted SUCI data during UE registration.
Original NVD description (English source)
free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, free5GC's SMF mounts the UPI management route group without inbound OAuth2 middleware. On top of that, the DELETE /upi/v1/upNodesLinks/{upNodeRef} handler unconditionally dereferences upNode.UPF after the type-guarded async release, even though AN-typed nodes are constructed without a UPF object. As a result, a single unauthenticated DELETE /upi/v1/upNodesLinks/gNB1 request crashes the handler with a nil-pointer panic AND mutates the in-memory user-plane topology before panicking (the UpNodeDelete(upNodeRef) line runs first). This is an unauthenticated, state-mutating panic-DoS sink that an off-path network attacker can trigger by name against any AN entry. This vulnerability is fixed in 4.2.2.