Null Pointer Dereference Vulnerability in Free5GC SMF Component
CVE-2026-1976

6.9MEDIUM

Key Information:

Vendor

Free5GC

Status
Free5gc
Vendor
CVE Published:
6 February 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-1976?

A vulnerability has been discovered in the Free5GC product, specifically within the SessionDeletionResponse function of the SMF component. This flaw allows an attacker to remotely trigger a null pointer dereference, which could lead to service disruption. The vulnerability has been publicly disclosed, and it is recommended to implement the available patches promptly to mitigate potential exploitation. Organizations using Free5GC versions up to 4.1.0 are advised to review their security measures and apply the necessary updates.

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Affected Version(s)

Free5GC 4.0

Free5GC 4.1.0

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-2026-1976 - Proof of Concept

References

https://vuldb.com/?id.344498
vdb-entrytechnical-description
https://vuldb.com/?ctiid.344498
signaturepermissions-required
https://vuldb.com/?submit.743239
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

LinZiyu (VulDB User)
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