---
id: CVE-2026-114230
title: >-
  Apache Qpid Proton C: Potential authentication bypass: regular AMQP frames can
  be sent as SASL frames
summary: >-
  When dispatching SASL frames to authenticate the peer, Proton will also
  dispatch AMQP frames if they claim to be SASL frames. This allows
  authentication bypass. However there will be no user name set so the effects
  depend on how the appl…
severity: none
cwe:
  - CWE-305
vendor: Apache Software Foundation
product: Apache Qpid Proton C
affected:
  - apache_qpid_proton_c <= 0.40.0
published: '2026-10-29'
updated: '2026-10-29'
sourceUpdated: '2026-10-29T11:09:06.927Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-114230'
references:
  - url: 'https://lists.apache.org/thread.html/ob7vo6swpj4wbb2m3zq9q2vkwfg5dg8k'
tags:
  - cve.org
epss: 0.00268
epssPercentile: 0.18957
ingestedAt: '2026-11-01T17:57:46.228Z'
---

## Overview

When dispatching SASL frames to authenticate the peer, Proton will also dispatch AMQP frames if they claim to be SASL frames. This allows authentication bypass. However there will be no user name set so the effects depend on how the application deals with this condition - which otherwise means that authentication has not completed yet.



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.

## Affected

- `apache_qpid_proton_c <= 0.40.0`

## Remediation

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