Is CVE-2026-44323 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-44323 being exploited in the wild.

How severe is CVE-2026-44323?

Medium severity, with a CVSS score of 4.3, published 27 May 2026.

Which products and versions are affected?

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

Is there a fix for CVE-2026-44323?

Yes. github.com/free5gc/udr (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-2026-44323 attacked?

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

Am I affected by CVE-2026-44323?

Check whether you run free5GC Udr or github.com/free5gc/udr (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-2026-44323: free5GC UDR nil pointer dereference in nudr-dr DELETE handler

Q: Which products and versions are affected?

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

Q: Is there a fix for CVE-2026-44323?

Yes. github.com/free5gc/udr (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-2026-44323 attacked?

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

Q: Am I affected by CVE-2026-44323?

Check whether you run free5GC Udr or github.com/free5gc/udr (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-2026-44323 · Severity: medium · CVSS 4.3 · Published 2026-05-27

A vulnerability exists in free5GC's Unified Data Repository (UDR), a component used in 5G core networks to manage subscriber data. An authenticated user can cause the service to crash or return error messages by sending a specifically crafted request to delete subscription data that does not exist. While the system automatically recovers from each crash, a repeated attack could degrade the performance and availability of the subscriber database.

Technologies: free5GC Udr, github.com/free5gc/udr (Go). Vendors: free5GC, Go.

Quick answers

Is CVE-2026-44323 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-44323 being exploited in the wild.
How severe is CVE-2026-44323?: Medium severity, with a CVSS score of 4.3, published 27 May 2026.
Which products and versions are affected?: free5GC Udr < 1.4.3, <= 4.2.1; github.com/free5gc/udr (Go) < 1.4.3, SEMVER:introduced=0,fixed=1.4.3.
Is there a fix for CVE-2026-44323?: Yes. github.com/free5gc/udr (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-2026-44323 attacked?: It is attacked over the network, in a hosted service.
Am I affected by CVE-2026-44323?: Check whether you run free5GC Udr or github.com/free5gc/udr (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/udr (Go): upgrade to 1.4.3 or later
```
go get github.com/free5gc/udr@v1.4.3
```

Technical details

A NULL pointer dereference (CWE-476) exists in the free5GC UDR 'nudr-dr' service within the 'RemoveAmfSubscriptionsInfoProcedure' handler. The vulnerability is triggered when a DELETE request is made to the '/subscription-data/{ueId}/{servingPlmnId}/ee-subscriptions/{subsId}/amf-subscriptions' endpoint with a non-existent 'subsId' after UE state has been initialized. The code identifies the missing subscription and prepares a 404 error but fails to return, subsequently attempting to access a member of the nil subscription object. This results in a panic that is caught by the Gin recovery middleware, returning an HTTP 500 error. An attacker with a valid OAuth2 access token can repeatedly trigger this panic to cause a denial-of-service. The issue is fixed in version 1.4.3.

Affected products

free5GC udr < 1.4.3

Identifiers

CVE-2026-44323
GHSA-4rqf-grm6-vf75
GO-2026-5131

Timeline

2026-03-22: other: Vulnerability validated in lab environment
2026-05-08: advisory: GitHub Advisory published
2026-05-27: other: NVD published CVE-2026-44323

References

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