CVE-2026-5360Public exploitNetwork attack vector

Service disruption via unchecked PrintableString decoding

Published Apr 2, 2026 · Updated Apr 2, 2026

Type confusion in free5GC 4.2.0 aper decoding allows remote attackers to disrupt AMF service with invalid PrintableString bytes. The parseField string branch treated ASN.1 PrintableString content as an unrestricted octet string and assigned it without X.680 character validation. A crafted NGSetupRequest RANNodeName over NGAP reaches the decoder; accepted control bytes create a crash path when later AMF logic consumes the value.

CVSS severity3.7
Low
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Type confusion in free5GC 4.2.0 aper decoding allows remote attackers to disrupt AMF service with invalid PrintableString bytes. The parseField string branch treated ASN.1 PrintableString content as an unrestricted octet string and assigned it without X.680 character validation. A crafted NGSetupRequest RANNodeName over NGAP reaches the decoder; accepted control bytes create a crash path when later AMF logic consumes the value.

The record

CVE
CVE-2026-5360
Published
Apr 2, 2026
Updated
Apr 2, 2026
Vendor
free5GC
Product
free5GC
Classifications
CWE-843, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

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

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=4.2.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

free5GC · free5GCversion=4.2.0

Published CVSS scores

3.7VulDBCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
2.6VulDBAV:N/AC:H/Au:N/C:N/I:N/A:P
2.9VulDBCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P

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-843Access of Resource Using Incompatible Type ('Type Confusion')
T1499.004Application or System Exploitation

Public exploit references

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo