---
id: "CVE-2026-33969"
kind: "vulnerability"
aliases: ["CVE-2026-33969"]
title: "NAS Authentication Request decoding loops forever, causing denial of service"
severity: "unknown"
cvss: null
epss: null
exploited: false
status: "open"
category: "other"
products: []
ecosystems: []
tags: ["cellular-core", "nas-protocol", "other"]
not_affected_if: []
published_at: "2026-11-05T03:17:26+00:00"
first_seen_at: "2026-11-05T03:31:43+00:00"
updated_at: "2026-11-05T03:33:52+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33969", "first_seen_at": "2026-11-05T03:31:43+00:00"}]
exploit_sources: []
---

# NAS Authentication Request decoding loops forever, causing denial of service

A missing lower bound check in the decoder for NAS Authentication Request messages (the cellular core signalling protocol) makes the procedure loop indefinitely. An attacker who can send such a message can stall the affected component and cause a denial of service.

_Summary, check and fix written by a model from the sources; labelled as such._

## Timeline

- 2026-11-05T03:31:43+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-33969

## From the sources

In the NAS Authentication Request message decoding procedure, a missing lower bound check causes an infinite loop, leading to Denial of Service.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_