Denial of Service Vulnerability in Open5GS's UDM Component
CVE-2026-7781

5.3MEDIUM

Key Information:

Vendor: Open5GS
Status: Open5gs
Vendor: CVE Published:; 4 May 2026

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👾 Exploit Exists🟡 Public PoC

What is CVE-2026-7781?

A security vulnerability has been identified in Open5GS versions up to 2.7.7, specifically within the amf-3gpp-access component's udm_nudm_uecm_handle_amf_registration_update function. This flaw allows attackers to disrupt service, potentially resulting in denial of service. The vulnerability can be exploited remotely, and although the discovery was communicated to the Open5GS project through an issue report, there has been no official response or remediation. It is critical for users and developers to address this security flaw promptly to mitigate its impact.

Affected Version(s)

Open5GS 2.7.0

Open5GS 2.7.1

Open5GS 2.7.2

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-7781 - Proof of Concept