CVE-2026-44328High· 8.2▾ Twilightfree5GC 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 u…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 45.1 · likelihood 0.1 · exploitation 0
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Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
Last analysed / modified upstream
0.5%
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.
free5gc < 4.2.2Upgrade past the affected range:
free5gc 4.2.2Connected by shared product, vendor, weakness, or advisory.
CVE-2026-44329Critical· 10.0free5GC is an open-source implementation of the 5G core network
CVE-2026-44320High· 7.3free5GC is an open-source implementation of the 5G core network
CVE-2026-44321High· 7.5free5GC is an open-source implementation of the 5G core network
CVE-2026-44327Critical· 10.0free5GC is an open-source implementation of the 5G core network
CVE-2026-44326Critical· 9.4free5GC is an open-source implementation of the 5G core network
CVE-2026-44322High· 7.5free5GC is an open-source implementation of the 5G core network