A flaw was found in dash. When built without libc fnmatch, the internal pmatch() matcher implements by unbounded recursion over candidate positions. A local user who can plant filenames, or otherwise feed that matcher, can make a short multi-star pattern such as .....tar.gz consume excessive CPU.

A flaw was found in dash. The printf builtin reserves four bytes before converting a Unicode \u or \U escape, but the multi-byte token can need five or six bytes. A local user who can supply such an escape to dash printf or echo %b, including through dash -c and a positional argument, can write one or two bytes past that reservation.

Untrusted search path vulnerability in dash 0.5.4, when used as a login shell, allows local users to execute arbitrary code via a Trojan horse .profile file in the current working directory.