Is CVE-2026-44328 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-44328 being exploited in the wild.

How severe is CVE-2026-44328?

High severity, with a CVSS score of 8.2, published 27 May 2026.

Which products and versions are affected?

free5GC Smf < 1.4.3, <= 4.2.1; github.com/free5gc/smf (Go) < 1.4.3, SEMVER:introduced=0,fixed=1.4.3.

Is there a fix for CVE-2026-44328?

Yes. github.com/free5gc/smf (Go): upgrade to 1.4.3 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-44328 attacked?

It is attacked over the network, in a hosted service.

Am I affected by CVE-2026-44328?

Check whether you run free5GC Smf or github.com/free5gc/smf (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-44328: free5GC SMF unauthenticated DoS and state mutation in UPI handler

Q: Which products and versions are affected?

free5GC Smf < 1.4.3, <= 4.2.1; github.com/free5gc/smf (Go) < 1.4.3, SEMVER:introduced=0,fixed=1.4.3.

Q: Is there a fix for CVE-2026-44328?

Yes. github.com/free5gc/smf (Go): upgrade to 1.4.3 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

Q: How is CVE-2026-44328 attacked?

It is attacked over the network, in a hosted service.

Q: Am I affected by CVE-2026-44328?

Check whether you run free5GC Smf or github.com/free5gc/smf (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-44328 · Severity: high · CVSS 8.2 · Published 2026-05-27

A vulnerability in the free5GC Session Management Function (SMF) allows an unauthenticated attacker to delete critical network nodes from the system's memory. The SMF is a core component of 5G networks responsible for managing user sessions; by exploiting this flaw, an attacker can disrupt network connectivity and cause the management service to crash. This can lead to a denial of service for mobile users and require manual intervention to restore the network's topology.

Technologies: free5GC Smf, github.com/free5gc/smf (Go). Vendors: free5GC, Go.

Quick answers

Is CVE-2026-44328 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-44328 being exploited in the wild.
How severe is CVE-2026-44328?: High severity, with a CVSS score of 8.2, published 27 May 2026.
Which products and versions are affected?: free5GC Smf < 1.4.3, <= 4.2.1; github.com/free5gc/smf (Go) < 1.4.3, SEMVER:introduced=0,fixed=1.4.3.
Is there a fix for CVE-2026-44328?: Yes. github.com/free5gc/smf (Go): upgrade to 1.4.3 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-44328 attacked?: It is attacked over the network, in a hosted service.
Am I affected by CVE-2026-44328?: Check whether you run free5GC Smf or github.com/free5gc/smf (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

github.com/free5gc/smf (Go): upgrade to 1.4.3 or later
```
go get github.com/free5gc/smf@v1.4.3
```

Technical details

The free5GC SMF UPI management route group is mounted without OAuth2 authentication middleware, making its endpoints reachable unauthenticated. In the 'DELETE /upi/v1/upNodesLinks/{ref}' handler, the code unconditionally dereferences the 'UPF' field of a node object. However, Access Network (AN) nodes are constructed with a nil 'UPF' field, leading to a nil pointer dereference and a panic. Crucially, the 'UpNodeDelete' function is called before the panic occurs, meaning the in-memory user-plane topology is mutated (nodes are deleted) even if the request fails. This allows an off-path network attacker to persistently deny SMF's ability to establish PFCP paths for UE sessions. The issue is fixed in SMF version 1.4.3.

Affected products

free5GC SMF < 1.4.3

Identifiers

CVE-2026-44328
GHSA-p9mg-74mg-cwwr
GO-2026-5537

Timeline

2026-05-07: disclosed
2026-05-08: advisory: GitHub Advisory published
2026-05-27: other: NVD published

References

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