How severe is CVE-2026-40246?

CVE-2026-40246 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2026-40246 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (30th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-40246?

CVE-2026-40246 affects Free5gc. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-40246?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-40246 have an EU (EUVD) identifier?

Yes. CVE-2026-40246 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-23304.

When was CVE-2026-40246 published?

CVE-2026-40246 was published on 2026-04-16 and last updated on 2026-06-17.

CVE-2026-40246

CVE-2026-40246 is a high-severity vulnerability in Free5gc with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-285.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v4: 8.7
EPSS exploit prediction: 0% (30th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-23304
Weakness: CWE-285
Affected product: Free5gc
Published: 2026-04-16
Last modified: 2026-06-17

Description

free5GC is an open-source implementation of the 5G core network. In versions 1.4.2 and below of the UDR service, the handler for deleting Traffic Influence Subscriptions checks whether the influenceId path segment equals subs-to-notify, but does not return after sending the HTTP 404 response when validation fails. Execution continues and the subscription is deleted regardless. An unauthenticated attacker with access to the 5G Service Based Interface can delete arbitrary Traffic Influence Subscriptions by supplying any value for the influenceId path segment, while the API misleadingly returns a 404 Not Found response. A patched version was not available at the time of publication.

Frequently asked questions

What is CVE-2026-40246?: free5GC is an open-source implementation of the 5G core network. In versions 1.4.2 and below of the UDR service, the handler for deleting Traffic Influence Subscriptions checks whether the influenceId path segment equals subs-to-notify, but does not return after sending the HTTP 404 response when validation fails. Execution continues and the subscription is deleted regardless. An unauthenticated attacker with access to the 5G Service Based Interface can delete arbitrary Traffic Influence Subscriptions by supplying any value for the influenceId path segment, while the API misleadingly returns a 404 Not Found response. A patched version was not available at the time of publication.
How severe is CVE-2026-40246?: CVE-2026-40246 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2026-40246 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (30th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-40246?: CVE-2026-40246 affects Free5gc. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-40246?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-40246 have an EU (EUVD) identifier?: Yes. CVE-2026-40246 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-23304.
When was CVE-2026-40246 published?: CVE-2026-40246 was published on 2026-04-16 and last updated on 2026-06-17.

References

https://github.com/free5gc/free5gc/security/advisories/GHSA-g9cw-qwhf-24jp

Affected products (1)

cpe:2.3:a:free5gc:free5gc:*:*:*:*:*:*:*:*

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