{"action":"Upgrade zsh to 5.5-1 or later.","affected":[{"fixed":"5.5-1","introduced":"0"}],"component":"zsh","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:12","exploited":false,"fixed_versions":["5.5-1"],"id":"tcs_01M5NDHERAPEJBAKYGJSS5MTND","modified_at":"2026-10-23T18:03:58.469270746Z","published_at":"2018-02-27T22:29:00.590Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2018-7548","https://security-tracker.debian.org/tracker/CVE-2018-7548"],"severity":{"label":"critical","score":9.8},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2018-7548","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2018-7548"}],"summary":"In subst.c in zsh through 5.4.2, there is a NULL pointer dereference when using ${(PA)...} on an empty array result."}