What is the CVSS score of CVE-2026-27643?

CVE-2026-27643 has a CVSS 3.1 base score of 5.3 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N. EPSS exploitation probability: 0.0%.

Which versions of Free5gc are affected by CVE-2026-27643?

Organizations using versions should be aware of moderate risk from CVE-2026-27643 rated CVSS 5.3. Exploitation could compromise the security of affected deployments.. A patch is available.

Is there a public PoC exploit available for CVE-2026-27643?

Yes, a public proof-of-concept exploit is available for CVE-2026-27643. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2026-27643?

Within 30 days: Identify affected systems running versions and apply vendor patches as part of regular patch cycle. Vendor patch is available.

Free5gc CVE-2026-27643

MEDIUM

Error Message Information Leak (CWE-209)

2026-02-24 security-advisories@github.com

Information Disclosure Free5gc Udr

5.3

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

5.3 MEDIUM

AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:55 vuln.today

PoC Detected

Feb 25, 2026 - 15:46 vuln.today

Public exploit code

Patch released

Feb 25, 2026 - 15:46 nvd

Patch available

CVE Published

Feb 24, 2026 - 01:16 nvd

MEDIUM 5.3

DescriptionGitHub Advisory

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.

AnalysisAI

Information disclosure in free5GC UDR versions up to 1.4.1 allows remote attackers to obtain detailed internal parsing error messages through the NEF component's Nnef_PfdManagement service, enabling service fingerprinting and reconnaissance. Public exploit code exists for this vulnerability, and all deployments using the affected service are at risk. A patch is available in pull request 56 and should be applied immediately, as no application-level workarounds exist.

Technical ContextAI

Classified as CWE-209 (Error Message Information Leak). Affects Udr. 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. Th