Denial of Service in Open5GS NSSF Component by Open5GS
CVE-2026-8121

5.3MEDIUM

Key Information:

Vendor

Open5GS

Status
Open5gs
Vendor
CVE Published:
8 May 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-8121?

A vulnerability has been identified in Open5GS NSSF up to version 2.7.7, specifically within the function ogs_sbi_parse_plmn_list located in the /lib/sbi/conv.c file. This flaw enables remote attackers to exploit the affected component, resulting in denial of service conditions. The issue was previously reported to the Open5GS project; however, there has been no indication of a response or mitigation. With public disclosure, the risk of exploitation is significant, necessitating immediate attention from users of the affected versions.

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-2026-8121 - Proof of Concept

References

https://vuldb.com/vuln/361908
vdb-entrytechnical-description
https://vuldb.com/vuln/361908/cti
signaturepermissions-required
https://vuldb.com/submit/808422
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
.