Remote Vulnerability in Open5GS HSS Component Affecting User-Name Argument Manipulation
CVE-2026-78186

5.3MEDIUM

Key Information:

Vendor

Open5GS

Status
Open5gs
Vendor
CVE Published:
24 August 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-78186?

A vulnerability has been identified in Open5GS within the HSS component, specifically in the src/hss/hss-cx-path.c file. This issue allows for a manipulation of the User-Name argument, leading to a reachable assertion that can be exploited remotely. The vulnerability could allow attackers to execute specific actions without proper authorization, posing a significant security risk for affected installations. Users are strongly advised to apply the provided patch (c9abe09421eb99bbf1cd7862a3d375e58a4eb9e4) to mitigate this risk.

Affected Version(s)

Open5GS 2.0

Open5GS 2.1

Open5GS 2.2

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-2026-78186 - Proof of Concept

References

https://vuldb.com/vuln/394568
vdb-entrytechnical-description
https://vuldb.com/vuln/394568/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-78186
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

WeiYi (VulDB User)
.