Denial of Service Vulnerability in Open5GS NSSF Component
CVE-2026-8120

5.3MEDIUM

Key Information:

Vendor

Open5GS

Status
Open5gs
Vendor
CVE Published:
8 May 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-8120?

A vulnerability exists in the Open5GS NSSF component, specifically in the function nssf_nnrf_nsselection_handle_get_from_amf_or_vnssf located in /src/nssf/nnssf-handler.c. This flaw allows a remote attacker to conduct a denial of service attack, potentially disrupting system availability. Despite being reported early, no response has been documented from the project maintainers. As the exploit is publicly available, immediate action is recommended to mitigate potential risks.

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-2026-8120 - Proof of Concept

References

https://vuldb.com/vuln/361907
vdb-entrytechnical-description
https://vuldb.com/vuln/361907/cti
signaturepermissions-required
https://vuldb.com/submit/808421
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
.