CVE-2026-44328

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.

• CWE-306
• CWE-476
• CWE-862

• https://github.com/free5gc/free5gc/issues/905Exploit, Issue Tracking
• https://github.com/free5gc/free5gc/security/advisories/GHSA-p9mg-74mg-cwwrExploit, Vendor Advisory
• https://github.com/free5gc/smf/commit/b57bc48081c3d3a2f333d02eb78e4fd31a120debPatch
• https://github.com/free5gc/smf/pull/199Issue Tracking, Patch
• https://github.com/free5gc/free5gc/issues/905Exploit, Issue Tracking
• https://github.com/free5gc/free5gc/security/advisories/GHSA-p9mg-74mg-cwwrExploit, Vendor Advisory

Published

May 27, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

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