CVE-2026-66257highCWE-770

CVE-2026-66257: high-severity vulnerability in Apache Qpid Proton-J

Apache Qpid Proton-J: Unbounded symbol value caching can lead to pre-authentication resource exhaustion

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21Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 7.5epss 0.8%
A pre-authentication attacker could leverage unbounded symbol value caching to cause resource exhaustion leading to denial of service. This issue affects Apache Qpid Proton-J: through 0.34.1. Users are recommended to upgrade to version 0.35.0, which fixes the issue.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
Apache Software Foundation · Apache Qpid Proton-J
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CVE-2018-17187—CVE-2018-17187EPSS 2.5%CVE-2026-66274HIGHApache Qpid Proton-J: Unbounded type nesting can lead to pre-authentication stackoverflowEPSS 0.8%CVE-2026-66273HIGHApache Qpid Proton-J: Type size/count handling can lead to excessive allocation pre-authenticationEPSS 0.8%CVE-2026-66277MEDIUMApache Qpid Proton-J: Unable to govern the maximum number of transfer frames per incoming deliveryEPSS 0.7%CVE-2026-66276MEDIUMApache Qpid Proton-J: Unbounded disposition range handling can lead to denial of serviceEPSS 0.7%CVE-2026-66275MEDIUMApache Qpid Proton-J: Incoming session flow control window can be exceededEPSS 0.7%