Denial of Service Vulnerability in Open5GS SMF by Open5GS
CVE-2026-8251

5.3MEDIUM

Key Information:

Vendor

Open5GS

Status
Open5gs
Vendor
CVE Published:
10 May 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-8251?

A denial of service vulnerability has been identified in the Open5GS SMF, specifically in the function update_authorized_pcc_rule_and_qos located in the file /src/smf/npcf-handler.c. This vulnerability allows an attacker to disrupt the service functionality remotely by performing manipulation on this function. The issue was reported early to the Open5GS project, but no response has been documented. Exploits leveraging this vulnerability have been made public, heightening the urgency for affected users to assess their security posture.

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-2026-8251 - Proof of Concept

References

https://vuldb.com/vuln/362548
vdb-entrytechnical-description
https://vuldb.com/vuln/362548/cti
signaturepermissions-required
https://vuldb.com/submit/808480
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

FrankLin (VulDB User)
VulDB CNA Team
.