Hi, thanks for taking the time to report this.
According to the upstream bug, the fix is present from 2.37 onward, and
has been backported to the release branches down to 2.34, while Focal
has 2.31. Given the sheer size of the diff, I'm wary of backporting it
that far. Jammy should be possible, though.
It would make things much easier if you could provide us with a test
case for this :)
** Changed in: glibc (Ubuntu Focal)
Status: New => Won't Fix
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https://bugs.launchpad.net/bugs/2055302
Title:
Consider backporting glibc bug 12154 to ubuntu 20.04 - DNS resolution
fails if a CNAME target begins with a hyphen
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