In etcd before versions 3.3.23 and 3.4.10, it is possible to have an entry index greater then the number of entries in the ReadAll method in wal/wal.go. This could cause issues when WAL entries are being read during consensus as an arbitrary etcd consensus participant could go down from a runtime panic when reading the entry.
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{ "availability": "No subscription required", "ubuntu_priority": "medium", "binaries": [ { "binary_version": "3.2.26+dfsg-6ubuntu0.1", "binary_name": "etcd" }, { "binary_version": "3.2.26+dfsg-6ubuntu0.1", "binary_name": "etcd-client" }, { "binary_version": "3.2.26+dfsg-6ubuntu0.1", "binary_name": "etcd-client-dbgsym" }, { "binary_version": "3.2.26+dfsg-6ubuntu0.1", "binary_name": "etcd-server" }, { "binary_version": "3.2.26+dfsg-6ubuntu0.1", "binary_name": "etcd-server-dbgsym" }, { "binary_version": "3.2.26+dfsg-6ubuntu0.1", "binary_name": "golang-etcd-server-dev" } ] }