CVE-2026-30057Public exploitNetwork attack vector

AMF crash via improper multipart deserialization

Published Aug 27, 2026 · Updated Aug 27, 2026

Denial of service in free5GC 4.1.0 allows remote attackers to crash the AMF process via a crafted multipart request. The HTTPCreateUEContext handler passes multipart/related content to openapi.Deserialize, whose slice reflection calls FieldByName and panics. Network access to the Namf Communication CreateUEContext endpoint is sufficient; exploitation stops AMF service availability without reported data access or modification.

CVSS severity7.5
High
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

Denial of service in free5GC 4.1.0 allows remote attackers to crash the AMF process via a crafted multipart request. The HTTPCreateUEContext handler passes multipart/related content to openapi.Deserialize, whose slice reflection calls FieldByName and panics. Network access to the Namf Communication CreateUEContext endpoint is sufficient; exploitation stops AMF service availability without reported data access or modification.

The record

CVE
CVE-2026-30057
Published
Aug 27, 2026
Updated
Aug 27, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-770, 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

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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

CWE-770Allocation of Resources Without Limits or Throttling
T1499.004Endpoint Denial of Service: Application 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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