Is CVE-2026-40343 actively exploited?

No active exploitation of CVE-2026-40343 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-40343 be exploited remotely?

Yes. CVE-2026-40343 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-40343?

CVE-2026-40343 has a CVSS score of 5.8 (MEDIUM).

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MEDIUM

CVE-2026-40343

CWE-754Published: April 22, 2026· Updated: Apr 23, 2026

5.8

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:11.3th

Official 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.

NVD Source

Technical Analysis

CVE-2026-40343 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.