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CVE-2026-4531— Free5GC AMF handler.go HandleRegistrationComplete denial of service

Quick assessment

Affected
n/a Free5GC
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

free5GC是free5GC开源的一个第 5 代 (5G) 移动核心网络的开源项目。 Free5GC 4.1.0版本存在安全漏洞，该漏洞源于AMF组件文件internal/gmm/handler.go中函数HandleRegistrationComplete存在错误，可能导致拒绝服务攻击。

CVSS 5.3 · Medium EPSS 0.72% · P52

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-4531

Vulnerability Information
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Vulnerability Title
Free5GC AMF handler.go HandleRegistrationComplete denial of service
Source: CVE Program / CVE List V5
Vulnerability Description
A weakness has been identified in Free5GC 4.1.0. Affected is the function HandleRegistrationComplete of the file internal/gmm/handler.go of the component AMF. Executing a manipulation can lead to denial of service. The attack may be performed from remote. This patch is called 52e9386401ce56ea773c5aa587d4cdf7d53da799. It is best practice to apply a patch to resolve this issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
不恰当的资源关闭或释放
Source: CVE Program / CVE List V5
Vulnerability Title
free5GC 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
free5GC是free5GC开源的一个第 5 代 (5G) 移动核心网络的开源项目。 Free5GC 4.1.0版本存在安全漏洞，该漏洞源于AMF组件文件internal/gmm/handler.go中函数HandleRegistrationComplete存在错误，可能导致拒绝服务攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
- Free5GC 4.1.0 cpe:2.3:a:free5gc:free5gc:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-4531

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III. Intelligence Information for CVE-2026-4531

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Patches & Fixes for CVE-2026-4531 (2)

Vendor Advisories for CVE-2026-4531 (2)

Other References for CVE-2026-4531 (1)

Same Patch Batch · n/a · 2026-03-22 · 7 CVEs total

CVE-2026-4562 7.3 HIGH MacCMS Timming API Endpoint Timming.php weak authentication
CVE-2026-4542 5.4 MEDIUM SSCMS layerImage Endpoint LayerImageController.Submit.cs path traversal
CVE-2026-4538 5.3 MEDIUM PyTorch pt2 Loading deserialization
CVE-2026-4563 4.3 MEDIUM MacCMS Member Order Detail User.php order_info authorization
CVE-2026-4115 3.7 LOW PuTTY Ed25519 Signature ecc-ssh.c eddsa_verify signature verification
CVE-2026-4539 3.3 LOW pygments archetype.py AdlLexer redos

IV. Related Vulnerabilities

Same product: Free5GC
Same vendor: n/a
Same weakness: CWE-404

V. Comments for CVE-2026-4531

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