```Bug Advisory impacting Splice 0.5.11 - Splice 0.5.14

```Bug Advisory impacting Splice 0.5.11 - Splice 0.5.14

ALL VALIDATOR OPERATORS

Testing by the Splice team has uncovered an issue in the new topology client cache causing it to read stale data. In rare worst case scenarios this could cause a validator to desynchronize and require recovery from backup. The fix is expected to land in 0.5.15 so affected versions are 0.5.11-0.5.14.

0.5.11 has been live on DevNet since February 16th and this issue has not yet surfaced outside the Splice team's testing. But to prevent any potential issues until the 0.5.15 release, we recommend that you set the following extra config via environment variable on your participant.

- name: ADDITIONAL_CONFIG_DISABLE_NEW_TOPOLOGY_CLIENT value: | canton.participants.participant.topology.use-new-client = false

Validators may choose to instead stay on Splice 0.5.10, and upgrade directly to Splice 0.5.15 once this issue has been resolved.

However the preferred path is to upgrade to 0.5.11, 0.5.12, 0.5.13 and 0.5.14 in sequence, with the environment variable set as described above. ```