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CVE-2026-66257CWE-770

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

3Vexday Risk Score

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

ssvc Trackepss 0.3%
exploitation probability
0.3%top 75% of all CVEs
observed exploitation
nono source reports it
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.