Redis is an open source, in-memory database that persists on disk. In versions starting at 2.6 and prior to 7.4.3, An unauthenticated client can cause unlimited growth of output buffers, until the server runs out of memory or is killed. By default, the Redis configuration does not limit the output buffer of normal clients (see client-output-buffer-limit). Therefore, the output buffer can grow unlimitedly over time. As a result, the service is exhausted and the memory is unavailable. When password authentication is enabled on the Redis server, but no password is provided, the client can still cause the output buffer to grow from "NOAUTH" responses until the system will run out of memory. This issue has been patched in version 7.4.3. An additional workaround to mitigate this problem without patching the redis-server executable is to block access to prevent unauthenticated users from connecting to Redis. This can be done in different ways. Either using network access control tools like firewalls, iptables, security groups, etc, or enabling TLS and requiring users to authenticate using client side certificates.
This issue has been addressed in the following products: Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions Red Hat Enterprise Linux 8.4 Telecommunications Update Service Via RHSA-2025:4441 https://access.redhat.com/errata/RHSA-2025:4441
This issue has been addressed in the following products: Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions Red Hat Enterprise Linux 8.6 Telecommunications Update Service Via RHSA-2025:4561 https://access.redhat.com/errata/RHSA-2025:4561
This issue has been addressed in the following products: Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions Via RHSA-2025:4577 https://access.redhat.com/errata/RHSA-2025:4577
This issue has been addressed in the following products: Red Hat Enterprise Linux 8.8 Extended Update Support Via RHSA-2025:4607 https://access.redhat.com/errata/RHSA-2025:4607
This issue has been addressed in the following products: Red Hat Enterprise Linux 9.2 Extended Update Support Via RHSA-2025:4789 https://access.redhat.com/errata/RHSA-2025:4789
This issue has been addressed in the following products: Red Hat Enterprise Linux 9.4 Extended Update Support Via RHSA-2025:4788 https://access.redhat.com/errata/RHSA-2025:4788
This issue has been addressed in the following products: Red Hat Enterprise Linux 9 Via RHSA-2025:7429 https://access.redhat.com/errata/RHSA-2025:7429
This issue has been addressed in the following products: Red Hat Enterprise Linux 9 Via RHSA-2025:7438 https://access.redhat.com/errata/RHSA-2025:7438
This issue has been addressed in the following products: Red Hat Enterprise Linux 10 Via RHSA-2025:7509 https://access.redhat.com/errata/RHSA-2025:7509
This issue has been addressed in the following products: Red Hat Enterprise Linux 9.4 Extended Update Support Via RHSA-2025:7538 https://access.redhat.com/errata/RHSA-2025:7538
This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2025:7686 https://access.redhat.com/errata/RHSA-2025:7686