CVE-2026-30058Public exploitNetwork attack vector

AMF crash via short JSON Patch path

Published Aug 27, 2026 · Updated Aug 27, 2026

Improper input validation in free5GC AMF 4.0.1 allows remote attackers to crash the process with a crafted subscription PATCH request. ModifyAMFEventSubscriptionProcedure slices the JSON Patch path at byte 11 without first checking its length, causing a bounds panic for a short path. Network access to the AMF service-based interface and a subscription identifier are required; successful exploitation interrupts the AMF service.

CVSS severityUnavailable
Unscored
EPSS probability0.32%
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 AMF 4.0.1 allows remote attackers to crash the process with a crafted subscription PATCH request. ModifyAMFEventSubscriptionProcedure slices the JSON Patch path at byte 11 without first checking its length, causing a bounds panic for a short path. Network access to the AMF service-based interface and a subscription identifier are required; successful exploitation interrupts the AMF service.

The record

CVE
CVE-2026-30058
Published
Aug 27, 2026
Updated
Aug 27, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 27, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

No CVSS assessment is available in this record.

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.

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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

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

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Your stack

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