GHSA-f8mp-vj46-cq8v OpenClaw's shell env fallback trusts unvalidated SHELL path from host environment

• npm openclaw: < 2026.2.22 → fixed in 2026.2.22

The shell environment fallback path could invoke an attacker-controlled shell when `SHELL` was inherited from an untrusted host environment. In affected builds, shell-env loading used `$SHELL -l -c 'env -0'` without validating that `SHELL` points to a trusted executable. In threat-model terms, this requires local environment compromise or untrusted startup environment injection first; it is not a remote pre-auth path. The hardening patch validates `SHELL` as an absolute normalized executable, prefers `/etc/shells`, applies trusted-prefix fallback checks, and falls back safely to `/bin/sh` when validation fails. The dangerous env-var policy now also blocks `SHELL` overrides. Affected Packages / Versions • Package: `openclaw` (npm) • Affected versions: `= 2026.2.22` Fix Commit(s) • `25e89cc86338ef475d26be043aa541dfdb95e52a` Release Process Note The advisory pre-sets `patched_versions` to the planned next release (`2026.2.22`). After that npm release is published, maintainers can publish this advisory without further version-field edits. OpenClaw thanks @athuljayaram for reporting.