Vulnerability · Published May 27, 2026 · Assigned by GitHub_M
CVE-2026-44322free5GC: NEF 3gpp-pfd-management PATCH applications/{appId} panics on UDR access failure due to nil ProblemDetails dereference
High 7.5
In plain English
A high-severity null pointer dereference in free5gc from free5gc. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 33% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, free5GC's NEF PATCH /3gpp-pfd-management/v1/{afId}/transactions/{transId}/applications/{appId} handler panics with a nil-pointer dereference when the upstream UDR call fails AND the consumer wrapper returns err != nil together with a nil *ProblemDetails. The handler's errPfdData != nil branch builds its own problemDetailsErr correctly, but immediately after it reads problemDetails.Cause (the OTHER value, which is nil in this branch) and panics. Gin recovery converts the panic into HTTP 500, so a single PATCH against this endpoint returns 500 instead of the intended controlled error response whenever UDR access is failing. This vulnerability is fixed in 4.2.2.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/free5gc/nef | 1.2.3 | GHSA-j59f-x285-69jx |
| Go | github.com/free5gc/nef | 1.2.3 | GO-2026-5447 |
Affected products (as reported)
Weakness: CWE-476, CWE-754 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- https://github.com/free5gc/free5gc/security/advisories/GHSA-j59f-x285-69jx x_refsource_CONFIRM
- https://github.com/free5gc/free5gc/issues/925 x_refsource_MISC
- https://github.com/free5gc/nef/pull/22 x_refsource_MISC
- https://github.com/free5gc/nef/commit/72a47f3fab4dffbd227f8d92c5f69dca93b610cb x_refsource_MISC