---
id: "CVE-2026-105042"
kind: "vulnerability"
aliases: ["CVE-2026-105042"]
title: "Qpid Proton C: deeply nested message body can overflow stack and crash"
severity: "medium"
cvss: null
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["amqp", "c", "package", "qpid-proton"]
not_affected_if: ["no-untrusted-messages", "not-using-qpid-proton"]
published_at: "2026-10-29T11:17:24+00:00"
first_seen_at: "2026-10-29T11:24:27+00:00"
updated_at: "2026-10-29T11:25:42+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-105042", "first_seen_at": "2026-10-29T11:24:27+00:00"}]
---

# Qpid Proton C: deeply nested message body can overflow stack and crash

A message body that is deeply nested and decoded by pn_message_body() can overflow the stack in Apache Qpid Proton C through 0.40.0. The result is a crash of the process that decodes the message.

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

## How to check

- Check the installed Qpid Proton C version, for example with `pkg-config --modversion libqpid-proton` or your package manager.
- Look for applications that link Qpid Proton C and call `pn_message_body()` on messages received from untrusted peers.

## Fix

- Apache Qpid Proton C: upgrade to `0.41.1`

## Timeline

- 2026-10-29T11:24:27+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-105042

## From the sources

A message body that is deeply nested and decoded by pn_message_body() could overflow the stack and cause a crash.



This issue affects Apache Qpid Proton C: through 0.40.0.



Users are recommended to upgrade to version 0.41.1, which fixes the issue.

---

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