---
id: CVE-2026-106808
title: >-
  OpenAirInterface Core Network v2.2.1 has a stack-based buffer overflow
  vulnerability in the OAI CN5G UDM Nudm_UEAU Generate Authentication Data
  endpoint
summary: >-
  OpenAirInterface Core Network v2.2.1 has a stack-based buffer overflow
  vulnerability in the OAI CN5G UDM Nudm_UEAU Generate Authentication Data
  endpoint. The UDM passes attacker-controlled resynchronizationInfo.rand and
  auts values to co…
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: '2026-11-02T19:04:32.283075Z'
exploitAvailable: true
published: '2026-11-02'
updated: '2026-11-02'
sourceUpdated: '2026-11-02T19:05:07.660Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-106808'
references:
  - url: 'https://github.com/openairinterface/oai-cn5g-udm/issues/4'
  - url: 'https://gist.github.com/hackeryounow/66b7612729af8e205089097e68a42116'
tags:
  - cve.org
  - exploit-available
epss: 0.00528
epssPercentile: 0.44943
ingestedAt: '2026-11-05T19:30:42.784Z'
---

## Overview

OpenAirInterface Core Network v2.2.1 has a stack-based buffer overflow vulnerability in the OAI CN5G UDM Nudm_UEAU Generate Authentication Data endpoint. The UDM passes attacker-controlled resynchronizationInfo.rand and auts values to conv::hex_str_to_uint8(), which converts arbitrary-length hex strings into fixed-size stack buffers without validating the destination size. An unauthenticated attacker with access to the SBI interface and a valid SUPI can submit an oversized value to overwrite adjacent stack memory, corrupt the stack canary, and terminate the UDM process.

## Remediation

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