CVE-2026-44323

free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, free5GC's UDR nudr-dr DELETE /subscription-data/{ueId}/{servingPlmnId}/ee-subscriptions/{subsId}/amf-subscriptions handler contains a nil-pointer dereference reachable from a single authenticated request, after one preparatory authenticated EE-subscription create. The handler checks _, ok = UESubsData.EeSubscriptionCollection[subsId] and sets a 404 problem-details on the miss path, but then continues to UESubsData.EeSubscriptionCollection[subsId].AmfSubscriptionInfos -- dereferencing the same missing entry instead of returning. Gin recovery converts the panic into HTTP 500, but the endpoint remains repeatedly panicable. This vulnerability is fixed in 4.2.2.

• CWE-476

• https://github.com/free5gc/free5gc/issues/919Exploit, Issue Tracking
• https://github.com/free5gc/free5gc/security/advisories/GHSA-4rqf-grm6-vf75Exploit, Vendor Advisory
• https://github.com/free5gc/udr/commit/8a1d3c63be99d378806d771f086ff32f1867da99Patch
• https://github.com/free5gc/udr/pull/60Issue Tracking, Patch

Published

May 27, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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