In deletefiles in FDUPES before 2.2.0, a TOCTOU race condition allows arbitrary file deletion via a symlink.
https://github.com/adrianlopezroche/fdupes/compare/v2.1.2...v2.2.0
https://github.com/adrianlopezroche/fdupes/commit/85680897148f1ac33b55418e00334116e419717f
https://github.com/adrianlopezroche/fdupes/blob/4b6bcde1b3eb1cebe87cd30814f7d6cf4ee46e95/fdupes.c