How severe is CVE-2026-27643?

CVE-2026-27643 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2026-27643 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-27643?

CVE-2026-27643 affects Free5gc Udr. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-27643?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-27643 have an EU (EUVD) identifier?

Yes. CVE-2026-27643 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-7462.

When was CVE-2026-27643 published?

CVE-2026-27643 was published on 2026-02-24 and last updated on 2026-06-17.

CVE-2026-27643

CVE-2026-27643 is a medium-severity vulnerability in Free5gc Udr with a CVSS 3.x base score of 5.3. 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-209.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v4: 6.6
EPSS exploit prediction: 0% (19th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-7462
Weakness: CWE-209
Affected product: Free5gc Udr
Published: 2026-02-24
Last modified: 2026-06-17

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 1.4.1, the NEF component reliably leaks internal parsing error details (e.g., invalid character 'n' after top-level value) to remote clients, which can aid attackers in service fingerprinting. All deployments of free5GC using the Nnef_PfdManagement service may be affected. free5gc/udr pull request 56 contains a patch for the issue. There is no direct workaround at the application level. The recommendation is to apply the provided patch.

Frequently asked questions

What is CVE-2026-27643?: 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 1.4.1, the NEF component reliably leaks internal parsing error details (e.g., invalid character 'n' after top-level value) to remote clients, which can aid attackers in service fingerprinting. All deployments of free5GC using the Nnef_PfdManagement service may be affected. free5gc/udr pull request 56 contains a patch for the issue. There is no direct workaround at the application level. The recommendation is to apply the provided patch.
How severe is CVE-2026-27643?: CVE-2026-27643 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2026-27643 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-27643?: CVE-2026-27643 affects Free5gc Udr. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-27643?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-27643 have an EU (EUVD) identifier?: Yes. CVE-2026-27643 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-7462.
When was CVE-2026-27643 published?: CVE-2026-27643 was published on 2026-02-24 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:free5gc:udr:*:*:*:*:*:go:*:*

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