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CVE-2026-1683— Free5GC SMF PFCP handler.go HandlePfcpSessionReportRequest denial of service

Quick assessment

Affected
Free5GC SMF
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及之前版本存在安全漏洞，该漏洞源于PFCP组件中internal/pfcp/handler/handler.go文件的HandlePfcpSessionReportRequest函数存在操作不当，可能导致拒绝服务。

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-2026-1683

Vulnerability Information
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Vulnerability Title
Free5GC SMF PFCP handler.go HandlePfcpSessionReportRequest denial of service
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability has been found in Free5GC SMF up to 4.1.0. Affected by this vulnerability is the function HandlePfcpSessionReportRequest of the file internal/pfcp/handler/handler.go of the component PFCP. The manipulation leads to denial of service. Remote exploitation of the attack is possible. The exploit has been disclosed to the public and may be used. To fix this issue, it is recommended to deploy a patch.
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及之前版本存在安全漏洞，该漏洞源于PFCP组件中internal/pfcp/handler/handler.go文件的HandlePfcpSessionReportRequest函数存在操作不当，可能导致拒绝服务。
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 SMF 4.0 -

II. Public POCs for CVE-2026-1683

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III. Intelligence Information for CVE-2026-1683

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Patches & Fixes for CVE-2026-1683 (1)

Other References for CVE-2026-1683 (1)

Same Patch Batch · Free5GC · 2026-01-30 · 3 CVEs total

CVE-2026-1682 5.3 MEDIUM Free5GC SMF PFCP UDP Endpoint handler.go HandlePfcpAssociationReleaseRequest null pointer
CVE-2026-1684 5.3 MEDIUM Free5GC SMF PFCP UDP Endpoint pfcp_reports.go HandleReports denial of service

IV. Related Vulnerabilities

Same product: SMF
Same vendor: Free5GC
Same weakness: CWE-404

V. Comments for CVE-2026-1683

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