CVE Catalog

CVE-2026-40343

MediumCVSS 5.8
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Very high risk
8.63%

95th percentile - higher than 95% of all known CVEs

Summary

In free5GC UDR up to and including 1.4.2, a fail-open request handling flaw 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.

Risk Assessment

Unintended notification subscriptions with invalid data may be created, potentially disrupting policy behavior and dependent processes in the 5G core.

Recommendation

No patch is available — implement your own request validation controls and monitor free5GC updates.

Related vulnerabilities

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS