CVE-2026-55068Public exploitNetwork attack vectorHinoki check available

Control-plane interception via poisoned NF registration

Published Aug 28, 2026 · Updated Aug 28, 2026

Improper input validation in free5GC 4.2.2 and earlier allows remote attackers with SBI access to redirect control-plane signaling. The NRF RegisterNFInstance handler stores NF Profiles in MongoDB without checking identifiers, enums, required fields, timer ranges, or service endpoint addresses, and NFDiscover then advertises the poisoned records. The default deployment needs no configuration change; SBI reachability is the gate, and trusting network functions can expose credentials and signaling or lose service.

CVSS severity9.3
Critical
EPSS probability0.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Improper input validation in free5GC 4.2.2 and earlier allows remote attackers with SBI access to redirect control-plane signaling. The NRF RegisterNFInstance handler stores NF Profiles in MongoDB without checking identifiers, enums, required fields, timer ranges, or service endpoint addresses, and NFDiscover then advertises the poisoned records. The default deployment needs no configuration change; SBI reachability is the gate, and trusting network functions can expose credentials and signaling or lose service.

The record

CVE
CVE-2026-55068
Published
Aug 28, 2026
Updated
Aug 28, 2026
Vendor
free5GC
Product
free5GC
Classifications
CWE-20, T1557
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 28, 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=< 4.2.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

free5GC · free5GCversion=< 4.2.3

Published CVSS scores

9.3GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA: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-20Improper Input Validation
T1557Adversary-in-the-Middle

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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