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.
Advisories

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Fixes

Solution

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Workaround

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History

Thu, 29 Oct 2026 13:00:00 +0000

Type Values Removed Values Added
First Time appeared Apache
Apache qpid Proton-c
Vendors & Products Apache
Apache qpid Proton-c

Thu, 29 Oct 2026 12:30:00 +0000

Type Values Removed Values Added
References

Thu, 29 Oct 2026 10:30:00 +0000

Type Values Removed Values Added
Description 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.
Title Apache Qpid Proton C: Potential authentication bypass: regular AMQP frames can be sent as SASL frames
Weaknesses CWE-305
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: apache

Published:

Updated: 2026-10-29T11:09:06.927Z

Reserved: 2026-10-21T05:27:42.658Z

Link: CVE-2026-114230

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Deferred

Published: 2026-10-29T11:17:28.210

Modified: 2026-10-29T15:43:33.310

Link: CVE-2026-114230

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-29T12:29:12Z

Weaknesses