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CVE-2026-7781— Open5GS amf-3gpp-access Endpoint nudm-handler.c udm_nudm_uecm_handle_amf_registration_update denial of service

Quick assessment

Affected
n/a Open5GS
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.

Open5GS是Open5GS开源的一个 5G Core 和 Epc 的 C 语言开源实现，即 Lte/Nr 网络的核心网络。 Open5GS 2.7.7及之前版本存在安全漏洞，该漏洞源于文件/src/udm/nudm-handler.c中函数udm_nudm_uecm_handle_amf_registration_update的amf-3gpp-access端点问题，可能导致拒绝服务。

CVSS 4.3 · Medium EPSS 0.47% · P39

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 8

VendorProduct Version RangeStatus
n/a Open5GS 2.7.0 affected
2.7.1 affected
2.7.2 affected
2.7.3 affected
2.7.4 affected
2.7.5 affected
2.7.6 affected
2.7.7 affected
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I. Basic Information for CVE-2026-7781

Vulnerability Information
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Vulnerability Title
Open5GS amf-3gpp-access Endpoint nudm-handler.c udm_nudm_uecm_handle_amf_registration_update denial of service
Source: CVE Program / CVE List V5
Vulnerability Description
A security vulnerability has been detected in Open5GS up to 2.7.7. Affected by this issue is the function udm_nudm_uecm_handle_amf_registration_update of the file /src/udm/nudm-handler.c of the component amf-3gpp-access Endpoint. The manipulation leads to denial of service. The attack is possible to be carried out remotely. The exploit has been disclosed publicly and may be used. The project was informed of the problem early through an issue report but has not responded yet.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/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
Open5GS 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Open5GS是Open5GS开源的一个 5G Core 和 Epc 的 C 语言开源实现，即 Lte/Nr 网络的核心网络。 Open5GS 2.7.7及之前版本存在安全漏洞，该漏洞源于文件/src/udm/nudm-handler.c中函数udm_nudm_uecm_handle_amf_registration_update的amf-3gpp-access端点问题，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
- Open5GS 2.7.0 cpe:2.3:a:open5gs:open5gs:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-7781

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III. Intelligence Information for CVE-2026-7781

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Patches & Fixes for CVE-2026-7781 (1)

Same Patch Batch · n/a · 2026-05-04 · 17 CVEs total

CVE-2026-7733 7.3 HIGH funadmin Frontend Chunked Upload Endpoint UploadService.php chunkUpload unrestricted uploa
CVE-2026-31205 5.7 MEDIUM Pluck CMS 跨站脚本漏洞
CVE-2026-7780 4.3 MEDIUM Open5GS smf-registrations Endpoint udm-sm.c udm_state_operational denial of service
CVE-2026-7779 4.3 MEDIUM Open5GS authentication-subscription Endpoint nudr-handler.c udm_nudr_dr_handle_subscriptio
CVE-2025-70069 Assimp 资源管理错误漏洞
CVE-2025-70067 Assimp 安全漏洞
CVE-2025-70070 Assimp 代码问题漏洞
CVE-2025-70072 Assimp 缓冲区错误漏洞
CVE-2026-36365 caesium-image-compressor 命令注入漏洞
CVE-2026-38669 WCMS 跨站脚本漏洞
CVE-2026-37461 GoBGP 缓冲区错误漏洞
CVE-2026-37458 FRRouting 输入验证错误漏洞
CVE-2025-70071 Assimp 资源管理错误漏洞
CVE-2026-37459 FRRouting 资源管理错误漏洞
CVE-2026-38751 OpenSTAManager 代码问题漏洞
CVE-2025-67796 Rdiffweb 访问控制错误漏洞

IV. Related Vulnerabilities

Same product: Open5GS
Same vendor: n/a
Same weakness: CWE-404

V. Comments for CVE-2026-7781

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