CVE-2026-44324

Description

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 panics on a single authenticated request against a fresh UDR instance when the supplied ueId does not exist in UESubsCollection. The processor checks value, ok := udrSelf.UESubsCollection.Load(ueId) and sets a 404 USER_NOT_FOUND problem-details on the miss path, but execution continues and immediately runs value.(*udr_context.UESubsData) -- a Go type assertion on a nil interface, which panics with interface conversion: interface {} is nil, not *context.UESubsData. Gin recovery converts the panic into HTTP 500, but the endpoint remains repeatedly panicable. This vulnerability is fixed in 4.2.2.

Weakness classification

• security-advisories@github.com: CWE-704

Primary references

• security-advisories@github.com — Exploit, Issue Tracking
• security-advisories@github.com — Exploit, Vendor Advisory
• security-advisories@github.com — Patch
• security-advisories@github.com — Issue Tracking, Patch
• 134c704f-9b21-4f2e-91b3-4a467353bcc0 — Exploit, Issue Tracking
• 134c704f-9b21-4f2e-91b3-4a467353bcc0 — Exploit, Vendor Advisory