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UniFi OS (Dream Machines) 5.1.26 – safe to update?

Newer release in this line: UniFi OS (Dream Machines) 5.1.33 (2026-09-09). If you're updating now, check that one instead — it may already fix the issues reported here.

Security update: this release fixes security issues. Waiting carries its own risk — if your device is exposed, weigh that against the reports below.

What's in this release

CVEs fixed

No CVEs mapped to this release, though the vendor flags it as a security update.

Community reports

• Mention Errors that a hard drive has been removed. UDM Pro · Reddit · 2026-08-17

  So we have a UDM pro with a ubiquiti 10g disk. Lately I’ve been getting alerts that the hard drive has been removed then a few minutes later an alert that says hard drive has been installed. All equip is about 1-1/2 years old. UniFi 5.1.26 Protect 7.1.87 Could the drive already…

• Mention I'm trying to do dumb things (wireguard/pfsense Site-to-Site) · Reddit · 2026-08-16

  Howdy, I have a few friends that are playing around with networking.\ I have an established wireguard site-to-site tunnel between 2 pfsense boxes\ I've previously had a functional wireguard tunnel between my pfsense box, and a friends UDM-pro \ Friends UDM-pro was out of date, s…

• Mention High CPU and Memory usage on UDM SE · Reddit · 2026-08-13

  Hi Ubiquiti community, We are running into an issue with our UDM SE, which manages a network with about 20 switches and 26 APs of various models. The problem is that the UDM SE's RAM and CPU usage spikes out of control, making the Web GUI completely inaccessible—both locally via…

• Mention Dream Machine Pro - Videotron - Multiple disconnects almost daily · Reddit · 2026-08-10

  Is anyone else on Videotron Gigabit Internet experiencing almost daily disconnects in the evenings between 8:30-10PM? At first i thought it was an issue with port 9. I bought an SFP adaptor on port 10 and a couple of weeks later, the issue came back. I attempted to reset the vid…

• Mention New VLAN on UDM Pro carries zero client traffic — wired and wireless · Reddit · 2026-08-08

  Spent an evening on this and I'm out of ideas. Posting the full diagnosis in case someone recognizes the issue. UDM Pro, UniFi OS 5.1.26, Network 10.5.67. Seven UniFi switches, eight APs. Existing Default network (10.0.1.0/24) works perfectly and always has. Created a new Virtua…

• Mention Slow speeds through switch, works correctly through router. · Reddit · 2026-08-07

  Some context for my setup: AT&T fiber with passthrough UDM - Ver 5.1.26 - Network ver 10.5.67 US 16 PoE 150W Switch - Device version 7.4.1 Flex mini (disconnected for these tests) U6-Pro UAP -AC-Lite UNVR (and various cameras, 3 of witch are hard wired) Examples of speeds: https…

• Mention UDM Pro - OpenVPN Recent Change · Reddit · 2026-08-06

  Did the option to implement a kill switch on the OpenVPN Client recently disappear in a recent unifi OS or network change? I had an OpenVPN client configured and working properly for months Recently traffic routed through that VPN client failed. The status of the OpenVPN client…

Reports are found automatically and labelled by an AI model plus keyword rules — they can be wrong. Open the post to judge for yourself.

← UniFi OS (Dream Machines) 5.1.19 · UniFi OS (Dream Machines) 5.1.31 →

Other UniFi OS (Dream Machines) versions

• 5.1.33 2026-09-09
• 5.1.31 2026-08-20
• 5.1.30 Release candidate / early access 2026-08-17
• 5.1.27 Release candidate / early access 2026-08-04
• 5.1.26 2026-07-22
• 5.1.19 2026-06-17
• 5.1.15 2026-06-01
• 5.1.12 2026-05-21