Denial of Service Vulnerability in Free5GC by Linux Foundation
CVE-2026-5661

6.9MEDIUM

Key Information:

Vendor

Linux Foundation

Status
Free5gc
Vendor
CVE Published:
6 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-5661?

A vulnerability has been discovered in the Free5GC 4.2.0 framework, affecting the NGSetupRequest Handler component. An attacker could exploit this vulnerability to initiate a denial of service attack, which can be executed remotely. The exploit is publicly accessible, posing significant risks to operational stability. Organizations using this version of Free5GC should implement immediate security measures to mitigate potential threats.

Affected Version(s)

Free5GC 4.2.0

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-2026-5661 - Proof of Concept

References

https://vuldb.com/vuln/355485
vdb-entry
https://vuldb.com/vuln/355485/cti
signaturepermissions-required
https://vuldb.com/submit/785896
third-party-advisory

CVSS V4

Score:
6.9
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

shovon0203 (VulDB User)
.