Long story short: this is a false positive.
The react-intl-next
is actually overridden by a either a “resolutions” entry or by setting the version to npm:react-intl@^5.18.1
in all the Atlassian packages that have a dependency on this. The problem is that Snyk does not pick up on this as it only scans the actual dependencies and not the resolutions.
It would be better if Atlassian just updates the packages to use react-intl
directly instead of redirecting it, but it seems that Atlassian has no incentive to do so.
There are other threads on this forum that mention this: