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.

CVSS 3.1

6.5CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS

0.4% chance of exploitation in the next 30 days; higher than 28% of CVEs (scores of 2026-10-25)

CWE

CWE-476

Published

2026-05-27

Modified

2026-10-14

Record from

the NVD, synced 2026-10-19

Affected

• free5gc:free5gc

Packages (OSV)

References

• https://github.com/free5gc/free5gc/issues/919
• https://github.com/free5gc/free5gc/security/advisories/GHSA-4rqf-grm6-vf75
• https://github.com/free5gc/udr/commit/8a1d3c63be99d378806d771f086ff32f1867da99
• https://github.com/free5gc/udr/pull/60

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