Technically, you are right. But this is due to the different release systems.
In Debian, security updates for the stable version are distributed via the security repository until a new point release is created. The last point release was two months ago.
However, in practice, on Debian Trixie, you get the fixed version by running a standard apt update& apt upgrade.
If you are speaking about the latest php bug, debian stable and old stable were updated days ago, see https://security-tracker.debian.org/
it might be a failure to read on my part but this reads as unfixed on Debian but fixed on Arch
Edit: Oh, yeah ok, in the security repo it’s fixed, why is the vulnerable version distributed to stable though?
Technically, you are right. But this is due to the different release systems.
In Debian, security updates for the stable version are distributed via the security repository until a new point release is created. The last point release was two months ago.
However, in practice, on Debian Trixie, you get the fixed version by running a standard
apt update & apt upgrade.