CVE-2026-27643

MEDIUM EPSS 19.2%
Published Feb 24, 20264mo ago · Modified Jun 17, 20261w ago
6.6 CVSS 4.0
Medium
Find Similar
Published Feb 24, 2026 4mo ago
Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score
6.6
Exploitability
—
Impact
—
Vector string
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
19.2% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 1

CWE-209

Affected Products 1

VendorProductVersionRange
free5gcudr* ≤1.4.1

References 4

  • github.com https://github.com/free5gc/free5gc/issues/753
    ExploitIssue TrackingPatchVendor Advisory
  • github.com https://github.com/free5gc/free5gc/security/advisories/GHSA-6468-f87j-6g82
    PatchVendor Advisory
  • github.com https://github.com/free5gc/udr/commit/754d23b03755ad59077ed529ce3b971e477080c4
    Patch
  • github.com https://github.com/free5gc/udr/pull/56
    Issue TrackingPatch

Remediation

  • github.com https://github.com/free5gc/free5gc/issues/753
    ExploitIssue TrackingPatchVendor Advisory
  • github.com https://github.com/free5gc/free5gc/security/advisories/GHSA-6468-f87j-6g82
    PatchVendor Advisory
  • github.com https://github.com/free5gc/udr/commit/754d23b03755ad59077ed529ce3b971e477080c4
    Patch
  • github.com https://github.com/free5gc/udr/pull/56
    Issue TrackingPatch