This SRM 1.3.1-9346-1-NanoPacked updater is to the full installer that yesterday was linked via the Downloads pages. The Update 1 patch installer is still available on the Archive site under the SRM OS link '1.3.1-9346-1'.
SRM 1.3!! It looks like this is now on general availability and overnight 1.3.1-9346 was released only for it to be replaced straight away with 1.3.1-9346 Update 1.
Today there were four Synology security advisories: USB Copy; SSO Server; Note Station Client; Storage Analyzer. The package vulnerabilities are through remote authorised users, while the Note Station Client is a man-in-the-middle vulnerability.
All but SSO Server on DSM 6.2 are mitigated by updates for DSM 7.1, 7.0, and 6.2. Also, all the package fixes were released in 2021, so it is most likely that you have been using the fixes for a year or so already. Note Station Client was fixed in March 2022, so best to check that you are using it.