---
id: CVE-2026-117069
title: >-
  An integer truncation vulnerability in the NAS decoder of OpenAirInterface
  (OAI) CN5G AMF v2.2.1 allows an unauthenticated remote attacker to cause a
  denial of service (DoS) via crafted NAS Registration Requests containing a
  malformed IM…
summary: >-
  An integer truncation vulnerability in the NAS decoder of OpenAirInterface
  (OAI) CN5G AMF v2.2.1 allows an unauthenticated remote attacker to cause a
  denial of service (DoS) via crafted NAS Registration Requests containing a
  malformed IM…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cvssSource: adp
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-11-03T13:27:37.214345Z'
exploitAvailable: true
published: '2026-11-02'
updated: '2026-11-03'
sourceUpdated: '2026-11-03T13:28:29.224Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-117069'
references:
  - url: 'https://github.com/openairinterface/oai-cn5g-amf/issues/16'
  - url: 'https://gist.github.com/hackeryounow/1c6741be7d536bd98434ac270dbb1f60'
tags:
  - cve.org
  - exploit-available
epss: 0.00454
epssPercentile: 0.39632
ingestedAt: '2026-11-05T19:30:42.948Z'
---

## Overview

An integer truncation vulnerability in the NAS decoder of OpenAirInterface (OAI) CN5G AMF v2.2.1 allows an unauthenticated remote attacker to cause a denial of service (DoS) via crafted NAS Registration Requests containing a malformed IMEISV in the 5GS Mobile Identity IE. The Type6NasIe::Validate() function truncates a 32-bit length value to 16 bits, bypassing length validation and causing an out-of-bounds heap read in DecodeImeisv(), which can crash the AMF process.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.