# CVE-2026-40343

> Vulnerability · severity: **MEDIUM** (CVSS 5.8).

## Description

free5GC UDR is the user data repository (UDR) for free5GC, an an open-source project for 5th generation (5G) mobile core networks. In versions up to and including 1.4.2, a fail-open request handling flaw in the UDR service causes the `/nudr-dr/v2/policy-data/subs-to-notify` POST handler to continue processing requests even after request body retrieval or deserialization errors. This may allow unintended creation of Policy Data notification subscriptions with invalid, empty, or partially processed input, depending on downstream processor behavior. As of time of publication, a patched version is not available.

## Key facts

- **CVE ID:** CVE-2026-40343
- **Published:** 2026-04-22
- **CVSS severity:** MEDIUM
- **CVSS base score:** 5.8
- **CWE codes:** CWE-754

## Affected products

- `free5gc:free5gc`
- `free5gc:udr`

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-40343

## Citation

> AI Analytics. CVE-2026-40343. Retrieved 2026-07-15 from https://api.ai-analytics.org/cve/CVE-2026-40343. Derived from NIST NVD. Licensed CC0.

---

*[Dataset catalog](https://api.ai-analytics.org/datasets/) · [AI Analytics](https://api.ai-analytics.org/) · CC0 1.0*