CVE-2026-27642Public exploitNetwork attack vector

Information disclosure via unvalidated SUPI path parameters

Published Feb 24, 2026 · Updated Feb 24, 2026

Improper input validation in free5GC UDM 1.4.1 and earlier allows remote attackers to disclose system details via crafted SUPI values. The Nudm_UEAU POST handlers accept control characters in SUPI path parameters and pass them into an internal UDR URL, causing Go URL-parsing errors to surface instead of rejecting the request. Nudm_UEAU must be reachable; the result is error-detail disclosure and service fingerprinting, with no reported data modification or interruption.

CVSS severity7.5
High
EPSS probability0.51%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in free5GC UDM 1.4.1 and earlier allows remote attackers to disclose system details via crafted SUPI values. The Nudm_UEAU POST handlers accept control characters in SUPI path parameters and pass them into an internal UDR URL, causing Go URL-parsing errors to surface instead of rejecting the request. Nudm_UEAU must be reachable; the result is error-detail disclosure and service fingerprinting, with no reported data modification or interruption.

The record

CVE
CVE-2026-27642
Published
Feb 24, 2026
Updated
Feb 24, 2026
Vendor
free5GC
Product
Unified Data Management (UDM)
Classifications
CWE-20, 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 Management (UDM)version=<= 1.4.1

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
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

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-20Improper Input Validation
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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