Starship vulnerable to shell injection via undocumented, unpredictable shell expansion in custom commands

## Description Starship is a cross-shell prompt. Starting in version 1.0.0 and prior to version 1.20.0, undocumented and unpredictable shell expansion and/or quoting rules make it easily to accidentally cause shell injection when using custom commands with starship in bash. Version 1.20.0 fixes the vulnerability. ### PoC Have some custom command which prints out information from a potentially untrusted/unverified source. ``` [custom.git_commit_name] command = 'git show -s --format="%<(25,mtrunc)%s"' style = "italic" when = true ``` ### Impact This issue only affects users with custom commands, so the scope is limited, and without knowledge of others' commands, it could be hard to successfully target someone.

Source published

26 Jul 2024 21:24:18 UTC

Source modified

22 Dec 2025 16:44:26 UTC

Observed here

24 Oct 2026 13:19:54 UTC

Source terms

GitHub Advisory Database · CC-BY-4.0

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · GitHub Advisory Database · CC-BY-4.0. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS_V3 · CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Publisher rating · HIGH