I built recode from what I believed to be the upstream source:

https://github.com/rrthomas/recode/

and the bug is not there, although I couldn't pinpoint the specific
commit that fixed it.

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https://bugs.launchpad.net/bugs/1785336

Title:
  recode dumps core if filename >= 200 characters

Status in recode package in Ubuntu:
  Confirmed
Status in recode package in Debian:
  Unknown

Bug description:
  If a filename has 200 or more characters, recode aborts, dumping core.

  To reproduce:

  1. Generate a filename with 200 characters:

  paulo:~/tmp$ file=$(printf 'f%.0s' {1..200})

  2. Create a file with this name:

  paulo:~/tmp$ echo ã >$file

  3. Try to recode this file:

  paulo:~/tmp$ recode -v u8..latin1 $file
  Request: UTF-8..:libiconv:..ISO-8859-1
  Shrunk to: UTF-8..ISO-8859-1
  *** buffer overflow detected ***: recode terminated
  Aborted (core dumped)

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: recode 3.6-23
  ProcVersionSignature: Ubuntu 4.15.0-29.31-generic 4.15.18
  Uname: Linux 4.15.0-29-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.2
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Fri Aug  3 19:09:07 2018
  Dependencies:
   gcc-8-base 8-20180414-1ubuntu2
   libc6 2.27-3ubuntu1
   libgcc1 1:8-20180414-1ubuntu2
   librecode0 3.6-23
  InstallationDate: Installed on 2018-04-28 (97 days ago)
  InstallationMedia: Xubuntu 18.04 LTS "Bionic Beaver" - Release amd64 
(20180426)
  SourcePackage: recode
  UpgradeStatus: No upgrade log present (probably fresh install)

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