Thanks for flagging this, brought up this concern in some internal channels. For now you should (im told) be fine updating your yum config to point to the RHEL 9 repo.
sudo yum install vault
Updating Subscription Management repositories.
Unable to read consumer identity
This system is not registered with an entitlement server. You can use "rhc" or "subscription-manager" to register.
Last metadata expiration check: 0:01:59 ago on Thu Oct 23 20:57:08 2025.
Dependencies resolved.
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Package Architecture Version Repository Size
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Installing:
vault x86_64 1.21.0-1 hashicorp 167 M
Transaction Summary
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Install 1 Package
Total download size: 167 M
Installed size: 488 M
Is this ok [y/N]:
vault server -dev
==> Vault server configuration:
Administrative Namespace:
Api Address: http://127.0.0.1:8200
Cgo: disabled
Cluster Address: https://127.0.0.1:8201
Environment Variables: DBUS_SESSION_BUS_ADDRESS, DEBUGINFOD_IMA_CERT_PATH, GOTRACEBACK, GPG_TTY, HISTCONTROL, HISTSIZE, HOME, HOSTNAME, LANG, LESSOPEN, LOGNAME, LS_COLORS, MAIL, MOTD_SHOWN, PATH, PWD, SELINUX_LEVEL_REQUESTED, SELINUX_ROLE_REQUESTED, SELINUX_USE_CURRENT_RANGE, SHELL, SHLVL, SSH_CLIENT, SSH_CONNECTION, SSH_TTY, TERM, USER, XDG_RUNTIME_DIR, XDG_SESSION_CLASS, XDG_SESSION_ID, XDG_SESSION_TYPE, _
Go Version: go1.25.2
Listener 1: tcp (addr: "127.0.0.1:8200", cluster address: "127.0.0.1:8201", disable_request_limiter: "false", max_json_array_element_count: "10000", max_json_depth: "300", max_json_object_entry_count: "10000", max_json_string_value_length: "1048576", max_request_duration: "1m30s", max_request_size: "33554432", tls: "disabled")
Log Level:
Mlock: supported: true, enabled: false
Recovery Mode: false
Storage: inmem
Version: Vault v1.21.0, built 2025-10-21T19:33:18Z
Version Sha: 818ca8b3575ea937ca48b640baf35e1b2ede1833
==> Vault server started! Log data will stream in below: