---
id: "CVE-2026-112330"
kind: "vulnerability"
aliases: ["CVE-2026-112330"]
title: "Motor.NET: crafted message headers crash the service permanently"
severity: "high"
cvss: 8.7
epss: 0.00627
exploited: false
status: "open"
category: "package"
products: [{"name": "Motor.NET", "fixed": ["0.19.0"], "affected": "< 0.19.0", "ecosystem": "nuget"}]
ecosystems: ["nuget"]
tags: ["cloudevents", "denial-of-service", "dotnet", "message-queue", "motor.net", "nuget", "package", "rabbitmq"]
not_affected_if: ["motor-net-not-used", "no-untrusted-publishers", "not-using-cloudevents-headers"]
published_at: "2026-10-22T20:17:05+00:00"
first_seen_at: "2026-10-23T21:57:32+00:00"
updated_at: "2026-10-24T07:15:51+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-112330", "first_seen_at": "2026-10-23T21:57:32+00:00"}, {"source": "analyst", "url": null, "first_seen_at": "2026-10-23T23:38:42+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-112330", "first_seen_at": "2026-10-24T07:15:51+00:00"}]
---

# Motor.NET: crafted message headers crash the service permanently

Motor.NET (GDATASoftwareAG/motornet) before 0.19.0 throws an unhandled exception in ExtractCloudEvent when a message has malformed cloudEvents headers (invalid cloudEvents:motorversion, a lone double-quote value, or an unparsable typed attribute such as cloudEvents:time). The host treats it as fatal and stops. The unacknowledged message is redelivered on restart, so the service crash-loops until the message is removed. Anyone who can publish to a queue the service consumes can trigger it. CVSS 8.7 (v4) / 7.5 (v3.1), CWE-755. Reported by Alex Williams, Pellera Technologies.

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

## Affected

- nuget:Motor.NET affected < 0.19.0 fixed 0.19.0

## How to check

Check whether your .NET projects reference any Motor.* NuGet package (e.g. Motor.Extensions.Hosting) at a version below 0.19.0: run 'dotnet list package' or grep PackageReference in *.csproj. Then check who can publish to the queues or topics those services consume. A service that restarts repeatedly on one message is the symptom.

## Fix

Upgrade Motor.NET packages to 0.19.0 or later (release v0.19.0, PR #1785 'Fix unwanted host shutdown because of broken input'). Until then, restrict publish rights on consumed queues to trusted producers. If already crash-looping, remove or dead-letter the poison message.

## Timeline

- 2026-10-23T21:57:32+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-112330
- 2026-10-23T23:38:42+00:00 analyst — VulnCheck advisory + CVE record + v0.19.0 release read. No auth needed in Motor.NET itself: attacker needs publish access to a consumed queue. Not exploited, no public PoC found. No social search done. Sibling CVEs CVE-2026-112331 (Kafka) and -112332 (JsonNet) also fixed in 0.19.0.
- 2026-10-24T07:15:51+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-112330

## Documents

- [advisory] VulnCheck: Motor.NET < 0.19.0 RabbitMQ DoS via CloudEvents Headers https://www.vulncheck.com/advisories/motor-net-rabbitmq-denial-of-service-via-cloudevents-headers
- [advisory] CVE Record CVE-2026-112330 https://www.cve.org/CVERecord?id=CVE-2026-112330
- [fix] Motor.NET v0.19.0 release notes (fix shutdowns due to invalid CloudEvent envelopes) https://github.com/GDATASoftwareAG/motornet/releases/tag/v0.19.0

## From the sources

Motor.NET before 0.19.0 contains a denial of service vulnerability that allows a remote attacker who can publish to a consumed queue to crash the service permanently by sending a message with crafted cloudEvents headers. Attackers can supply an invalid cloudEvents:motorversion, a single double-quote header value, or an unparsable typed attribute such as cloudEvents:time to trigger an unhandled exception in ExtractCloudEvent that is treated as fatal, causing the application to stop and the unacknowledged message to be redelivered on restart, resulting in a permanent crash-loop.

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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_