Denial of Service Vulnerability in Open5GS Authentication-Subscription Endpoint
CVE-2026-7779

5.3MEDIUM

Key Information:

Vendor

Open5GS

Status
Open5gs
Vendor
CVE Published:
4 May 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-7779?

A security flaw has been identified in Open5GS up to version 2.7.7, specifically within the function udm_nudr_dr_handle_subscription_authentication, located in the /src/udm/nudr-handler.c file. This vulnerability allows for manipulation that leads to a denial of service, enabling attackers to disrupt the service remotely. The exploit has been publicly disclosed, with potential use in malicious attacks. Although the project team was notified of this issue, no response has been reported. It is essential for users to take preventive measures to safeguard their systems.

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-2026-7779 - Proof of Concept

References

https://vuldb.com/vuln/360976
vdb-entrytechnical-description
https://vuldb.com/vuln/360976/cti
signaturepermissions-required
https://vuldb.com/submit/806249
third-party-advisory

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

FrankyLin (VulDB User)
VulDB CNA Team
.