You're receiving this bug because the package in Summary has produced _FORTIFY_SOURCE related warnings indicating the presence of a sure overflow in a static buffer.
Even though this is not always an indication of a security problem it might even be. So please check this out ASAP.
By the way, _FORTIFY_SOURCE is disabled when you disable optimisation, so don't try finding out the cause using -O0.
Your friendly neighborhood tinderboxer
Created attachment 250123 [details]
Created attachment 260995 [details, diff]
Patch to fix the off-by-one overflow
This patch takes care of the FORTIFY_SOURCE error, but there seem to be many other issues with frodo on Unix-like OSes. It hasn't been updated upstream for 10 years but the author is supposed to be working on a complete re-write for version 5: see http://frodo.cebix.net/
As far as I can see, there is no advantage to running this instead of app-emulation/vice which works very well. So I would vote to remove this from the tree, at least until version 5 is available.
Unmaintained package with security problems, CCing treecleaners for removal