{"action":"Upgrade zsh to 5.4.1-1 or later.","affected":[{"fixed":"5.4.1-1","introduced":"0"}],"component":"zsh","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:12","exploited":false,"fixed_versions":["5.4.1-1"],"id":"tcs_01M5NCB0YEPQCBY7HF31SCZW0A","modified_at":"2026-09-01T20:03:46.913911250Z","published_at":"2018-02-27T22:29:00.480Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2017-18205","https://security-tracker.debian.org/tracker/CVE-2017-18205"],"severity":{"label":"high","score":8.1},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2017-18205","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2017-18205"}],"summary":"In builtin.c in zsh before 5.4, when sh compatibility mode is used, there is a NULL pointer dereference during processing of the cd command with no argument if HOME is not set."}