---
id: "CVE-2026-124759"
page: "https://infrastack.ai/live/CVE-2026-124759"
kind: "vulnerability"
aliases: ["CVE-2026-124759"]
title: "P-Net: forged industrial alarm frames can abort controller connections"
severity: "high"
cvss: 7.1
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: [{"name": "P-Net", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["embedded", "industrial-control", "infrastructure", "p-net", "profinet"]
not_affected_if: ["isolated-network", "no-profinet-devices", "version-1.0.4-or-later"]
published_at: "2026-11-13T14:17:50+00:00"
first_seen_at: "2026-11-13T15:19:49+00:00"
updated_at: "2026-11-13T15:21:19+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-124759", "first_seen_at": "2026-11-13T15:19:49+00:00"}]
exploit_sources: []
---

# P-Net: forged industrial alarm frames can abort controller connections

Link for people: https://infrastack.ai/live/CVE-2026-124759 (this .md is for agents)

P-Net is an embedded PROFINET device stack used in industrial equipment. A host on the same network segment can send a forged alarm frame to end an established Application Relationship or inject fake alarm notifications into the application.

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

## Affected

- vendor:P-Net affected range not listed fixed no fixed version listed

## How to check

- Check whether the device firmware or application includes P-Net, and its version, against `1.0.4` or later.
- Confirm whether the device is reachable from an adjacent network segment that untrusted hosts can join.

## Fix

- P-Net: move to `1.0.4` or later (per the NVD description: fixed before 1.0.4).

## Timeline

- 2026-11-13T15:19:49+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-124759

## From the sources

P-Net before 1.0.4 routes a received RTA alarm frame to an Application Relationship using only the destination alarm reference in the frame, without checking the source of the frame. A host with ADJACENT network access can abort an established Application Relationship with a single alarm ERROR frame, or deliver forged alarm notifications with chosen type, slot, subslot, USI and payload to the application.

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_