THREATPORT/VULNERABILITY/CVE-2026-40343
MEDIUM SEVERITY

CVE-2026-40343

Free5gc vulnerability

CVSS
5.8
EPSS
10.0%
EPSS pct
95th
Exploited
No known
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.
Affected vendor
Free5gc
Affected product
Free5gc
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
Weakness type (CWE)
Published
2026-04-22

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to low impact to integrity.

Its EPSS score of 10.0% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 95% of all scored CVEs.

Check your external exposure to CVE-2026-40343

  • Confirm whether Free5gc Free5gc is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2026-40343.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2026-40343

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