CVE-2026-114230
Potential authentication bypass: regular AMQP frames can be sent as SASL frames
Severity
Important
Affected components
Apache Qpid Proton C
Affected versions
versions through 0.40.0
Fixed versions
0.41.1 and later
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.
Resolution
Users are recommended to upgrade to version 0.41.1, which fixes the issue.
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