Unscored severity · published Oct 29, 2026
CVE-2026-114230
Apache Qpid Proton C: Potential authentication bypass: regular AMQP frames can be sent as SASL frames
New
–
CVSS
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EPSS
No
On KEV
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.
Exploitation
Is it being used?
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AQ
Apache Qpid Proton C · Apache Software Foundation
through 0.40.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-114230
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-114230
vendor-advisory
https://lists.apache.org/thread.html/ob7vo6swpj4wbb2m3zq9q2vkwfg5dg8k
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