Denial of Service Vulnerability in Open5GS by Open5GS
CVE-2026-8266

5.3MEDIUM

Key Information:

Vendor

Open5GS

Status
Open5gs
Vendor
CVE Published:
11 May 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-8266?

A vulnerability exists in Open5GS versions up to 2.7.7, specifically in the gsm_build_pdu_session_establishment_accept function located in /src/smf/gsm-build.c. This flaw allows an attacker to remotely exploit the vulnerability, resulting in a denial of service. Despite initial reporting to the project team, the issue remains unaddressed, leaving systems at risk. The exploit is now public, increasing the urgency for users to implement appropriate mitigation measures.

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-2026-8266 - Proof of Concept

References

https://vuldb.com/vuln/362563
vdb-entrytechnical-description
https://vuldb.com/vuln/362563/cti
signaturepermissions-required
https://vuldb.com/submit/808483
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
.