CVE-2026-27643Public exploitNetwork attack vector

Information disclosure via continued error-path execution

Published Feb 24, 2026 · Updated Feb 24, 2026

Information exposure in free5GC UDR 1.4.1 and earlier allows remote attackers to obtain parsing details through Nnef_PfdManagement. GetApplicationDataIndividualPfdFromDBProcedure writes a 404 response but continues and appends null, creating malformed JSON that exposes the NEF parser error. The service must be reachable; requesting a nonexistent application PFD reveals the failure and supports service fingerprinting.

CVSS severity5.3
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information exposure in free5GC UDR 1.4.1 and earlier allows remote attackers to obtain parsing details through Nnef_PfdManagement. GetApplicationDataIndividualPfdFromDBProcedure writes a 404 response but continues and appends null, creating malformed JSON that exposes the NEF parser error. The service must be reachable; requesting a nonexistent application PFD reveals the failure and supports service fingerprinting.

The record

CVE
CVE-2026-27643
Published
Feb 24, 2026
Updated
Feb 24, 2026
Vendor
free5GC
Product
Unified Data Repository (UDR)
Classifications
CWE-388, CWE-209, T1595.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=<= 1.4.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

free5GC · Unified Data Repository (UDR)version=<= 1.4.1

Published CVSS scores

6.6GitHub, Inc.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
5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-388Improper Error Handling
CWE-209Generation of Error Message Containing Sensitive Information
T1595.002Active Scanning: Vulnerability Scanning

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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