The official Mikrotik router thread

Sounds like this is a pretty big/important security update that got released today.

I am running on the long-term branch.

What's new in 7.23.4 (2026-09-03):

This is an important security update. Most configurations are not at risk, but upgrading is highly recommended. To give time to update your systems, we are not currently publishing detailed information.




Edit: After upgrading, my DHCPv6 Client stopped working, it gets stuck in a "Searching...." state, so I am stuck without IPv6 connectivity until that gets fixed, or unless I downgrade.
Others are reporting the same issue on the mikrotik forums.
 
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Thankfully the DHCPv6 issue was fixed in another urgent release, I have IPv6 connectivity again :)


What's new in 7.23.5 (2026-09-04):



The 7.23.4 release was an important security update. Most configurations are not at risk, but upgrading is highly recommended. To give you time to update your systems, we are not publishing detailed information yet. This release, 7.23.5, additionally addresses an urgent issue introduced in 7.23.4.



*) dhcp - fixed IPv6 DHCP functionality (introduced in v7.23.4);
 
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