atob 2.0.3 and earlier allocates uninitialized Buffers when number is passed in input on Node.js 4.x and below.
Created nodejs-atob tracking bugs for this issue:
Affects: fedora-28 [bug 1584890]
This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.
The linked hackerone report indicates that the issue was fixed in atob version 2.1.0, without pointing out any specific fix.