CVE-2026-27524

Impact

### 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.

Affected packages

Affected products

Weakness classification

References

• NVD record
• CVE.org record
• GitHub advisory
• https://github.com/openclaw/openclaw/commit/fbb79d4013000552d6a2c23b9613d8b3cb92f6b6
• https://github.com/openclaw/openclaw/security/advisories/GHSA-62f6-mrcj-v8h5
• https://www.vulncheck.com/advisories/openclaw-prototype-pollution-via-debug-override-path
• https://github.com/advisories/GHSA-62f6-mrcj-v8h5
• https://nvd.nist.gov/vuln/detail/CVE-2026-27524