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Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process. An unauthenticated remote attacker can exhaust server memory via the FindServers Discovery Service in open62541. The serverUris field of FindServersRequest is not validated for length or array size. An attacker can declare an arbitrarily large string (up to ~3.9 GB) delivered across intermediate chunks without ever sending the final chunk. The server buffers all chunks in RAM indefinitely until the SecureChannel times out. The attack is pre-session and bypasses all encryption configuration. The issue affects open62541: from 1.4.0 through 1.4.16, from 1.5.0 through 1.5.4, master.
FEDORA-2026-23b21104ef (open62541-1.5.6-1.fc44) has been submitted as an update to Fedora 44. https://bodhi.fedoraproject.org/updates/FEDORA-2026-23b21104ef
FEDORA-2026-1435f05fde (open62541-1.5.6-1.fc43) has been submitted as an update to Fedora 43. https://bodhi.fedoraproject.org/updates/FEDORA-2026-1435f05fde
FEDORA-2026-23b21104ef has been pushed to the Fedora 44 testing repository. Soon you'll be able to install the update with the following command: `sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-23b21104ef` You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-23b21104ef See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.
FEDORA-2026-1435f05fde has been pushed to the Fedora 43 testing repository. Soon you'll be able to install the update with the following command: `sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-1435f05fde` You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-1435f05fde See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.
FEDORA-2026-23b21104ef (open62541-1.5.6-1.fc44) has been pushed to the Fedora 44 stable repository. If problem still persists, please make note of it in this bug report.
FEDORA-2026-1435f05fde (open62541-1.5.6-1.fc43) has been pushed to the Fedora 43 stable repository. If problem still persists, please make note of it in this bug report.