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CVE-2026-27643

free5GC has improper error handling in NEF with information exposure

Published: Feb 24, 2026Updated: Feb 25, 2026 Sources: CVE List NVDCWE-209
5.3MEDIUM
NVD MITRE
EPSS Score
0.3%
Top 80.4%
CISA KEV
Not in KEV
Exploits
1 Known
Remediation
Patch Available
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:LI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-209

Affected Products

free5gc
oss-projectaka udm, free5gc udm, free5gc smf, smf
udrOn-premNetwork Device
Networking Infrastructure / network-management

Exploitability

1 exploit source identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Discovery
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References

https://github.com/free5gc/free5gc/issues/753
github.com
https://github.com/free5gc/free5gc/security/advisories/GHSA-6468-f87j-6g82
github.com
https://github.com/free5gc/udr/commit/754d23b03755ad59077ed529ce3b971e477080c4
github.com
and 1 more references View all →

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