CVE-2026-27524

Description

### 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.

How to fix CVE-2026-27524

To remediate CVE-2026-27524, upgrade the affected package to a fixed version below.

—upgrade to 2026.2.21 or later

Is CVE-2026-27524 being exploited?

Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.

Affected packages (1)

from 0, < 2026.2.21

CVSS scores

Source	Version	Severity	Vector
osv	CVSS 4.0	—	CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N