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Medium · 6.5 CVE-2026-67591 EUVD-2026-53089GHSA-xcxh-hgpq-crj6

Apache Qpid ProtonJ2: Incoming session flow control window can be exceeded

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

Description

An authenticated attacker could exceed the session flow control incoming window potentially leading to denial of service.

This issue affects Apache Qpid ProtonJ2: through 1.1.0.

Users are recommended to upgrade to version 1.2.0, which fixes the issue.

Affected products

VendorProductAffectedFixed
Apache Software Foundation Apache Qpid ProtonJ2 ≤ 1.1.0 —

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

ReleasePackageFixed inAdvisory
Ubuntu 26.10 qpid-proton No fix yet —
Ubuntu 26.04 LTS qpid-proton No fix yet —
Ubuntu 24.04 LTS qpid-proton No fix yet —
Ubuntu 22.04 LTS qpid-proton No fix yet —
Ubuntu 20.04 LTS qpid-proton No fix yet —
Show 2 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
Ubuntu 18.04 LTS qpid-proton No fix yet —
Ubuntu 16.04 LTS qpid-proton No fix yet —

References