Denial of Service Vulnerability in Open5GS by Open5GS
CVE-2026-4988

6.3MEDIUM

Key Information:

Vendor

Open5GS

Status
Open5gs
Vendor
CVE Published:
27 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-4988?

A vulnerability has been identified in Open5GS 2.7.6 affecting the CCA Message Handler functions (smf_gx_cca_cb, smf_gy_cca_cb, smf_s6b). This flaw can result in a denial of service, allowing attackers to disrupt the availability of the service remotely. While the complexity of the attack is high, and specific conditions may influence its successful exploitation, it poses a significant risk to systems using this version of Open5GS. The exploit code has been made publicly available, heightening the need for immediate attention.

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Affected Version(s)

Open5GS 2.7.6

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-2026-4988 - Proof of Concept

References

https://vuldb.com/?id.353875
vdb-entrytechnical-description
https://vuldb.com/?ctiid.353875
signaturepermissions-required
https://vuldb.com/?submit.771349
third-party-advisory

CVSS V4

Score:
6.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
High
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

ZiyuLin (VulDB User)
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