High · 7.5 CVE-2026-66257 EUVD-2026-53051GHSA-g4xc-w2cq-f2f8

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

Published Aug 5, 2026 · Updated Aug 6, 2026 · Assigned by apache

Description

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.

Vendor	Product	Affected	Fixed
Apache Software Foundation	Apache Qpid Proton-J	≤ 0.34.1	—