| Name | CVE-2018-7548 | 
| Description | In subst.c in zsh through 5.4.2, there is a NULL pointer dereference when using ${(PA)...} on an empty array result. | 
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) | 
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status | 
|---|
| zsh (PTS) | bullseye (security), bullseye | 5.8-6+deb11u1 | fixed | 
|  | bookworm | 5.9-4 | fixed | 
|  | forky, sid, trixie | 5.9-8 | fixed | 
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs | 
|---|
| zsh | source | (unstable) | 5.5-1 | unimportant |  |  | 
Notes
https://sourceforge.net/p/zsh/code/ci/110b13e1090bc31ac1352b28adc2d02b6d25a102
no security impact