GHSA-62f6-mrcj-v8h5 OpenClaw's runtime /debug override path accepted prototype-reserved keys

• npm openclaw: < 2026.2.21 → fixed in 2026.2.21

Summary OpenClaw accepted prototype-reserved keys in runtime `/debug set` override object values (`__proto__`, `constructor`, `prototype`). Impact `/debug` is disabled by default, and exploitation requires an already authorized `/debug set` caller. No unauthenticated vector was identified. This issue affects runtime in-memory overrides only (non-persistent and cleared on restart/reset). Given the required prior authorization boundary, this is treated as defense-in-depth hardening for command flag evaluation. Affected Packages / Versions • Package: `openclaw` (npm) • Latest published vulnerable version confirmed: `2026.2.19-2` • Vulnerable range: `<= 2026.2.19-2` • Patched in planned next release: `2026.2.21` Technical Details • Runtime override merges now block reserved prototype keys during deep merge. • Runtime override writes now sanitize nested object values to remove reserved prototype keys before storing overrides. • Restricted command gates (`bash`, `config`, `debug`) now require own-property boolean flags, preventing inherited prototype values from enabling commands. Fix Commit(s) • `fbb79d4013000552d6a2c23b9613d8b3cb92f6b6` Release Process Note `patched_versions` is pre-set to `2026.2.21` so after the npm release is live, this advisory can be published immediately. OpenClaw thanks @tdjackey for reporting.