When an updated firmware for Flex100H updating Tailscale - Security Vulnerability

Gibsonmb

The current firmware release for the USG FLEX 100H is V1.36(ABXF.0) released on the 20th October 2025. This contains a version of Tailscale that is know to have a significant security vulnerabilities, making it unsafe to use. That version (1.82.0-3) of Tailscale client is now very old and the current version is 1.92.3. When will there be a new firmware FLEX 100H release updating the Tailscale client, making it safe to use again?

Zyxel_Tina

Hi @Gibsonmb,

We understand your concern about using an older version with known vulnerabilities. We plan to release V1.37 this month, which includes Tailscale client version 1.90.8. Regarding version 1.90.8, you may refer to this changelog to check which vulnerabilities have been resolved. Please stay tuned to our News & Release section when the firmware becomes available for download.

Thank you for your understanding and patience!

Zyxel_Tina

Hi @Gibsonmb,

When we finalized the firmware plan, Tailscale v1.90.8 was the latest stable release available at that time, so we targeted that version accordingly. Tailscale v1.92.3 came out in mid-December—purely a timing difference after our integration decision was already completed. Therefore, the upcoming v1.37 firmware will include Tailscale v1.90.8.

best_heygman

And which significant security vulnerability would that be?

Zyxel_Tina

Hi @Gibsonmb,

We understand your concern about using an older version with known vulnerabilities. We plan to release V1.37 this month, which includes Tailscale client version 1.90.8. Regarding version 1.90.8, you may refer to this changelog to check which vulnerabilities have been resolved. Please stay tuned to our News & Release section when the firmware becomes available for download.

Thank you for your understanding and patience!

Gibsonmb

https://community.zyxel.com/en/discussion/comment/82516#Comment_82516

Multiple, I'm not about to amplify it to to others. Read the Tailscale logs.

Gibsonmb

OK, but still well behind the current release of Tailscale.

Zyxel_Tina

Hi @Gibsonmb,

When we finalized the firmware plan, Tailscale v1.90.8 was the latest stable release available at that time, so we targeted that version accordingly. Tailscale v1.92.3 came out in mid-December—purely a timing difference after our integration decision was already completed. Therefore, the upcoming v1.37 firmware will include Tailscale v1.90.8.