{"id":"CVE-2026-27524","aliases":["GHSA-62f6-mrcj-v8h5"],"url":"https://o3.security/vulnerability/CVE-2026-27524","summary":"OpenClaw < 2026.2.21 - Prototype Pollution via Debug Override Path","details":"### Summary\nOpenClaw accepted prototype-reserved keys in runtime `/debug set` override object values (`__proto__`, `constructor`, `prototype`).\n\n### Impact\n`/debug` is disabled by default, and exploitation requires an already authorized `/debug set` caller. No unauthenticated vector was identified.\n\nThis 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.\n\n### Affected Packages / Versions\n- Package: `openclaw` (npm)\n- Latest published vulnerable version confirmed: `2026.2.19-2`\n- Vulnerable range: `<= 2026.2.19-2`\n- Patched in planned next release: `2026.2.21`\n\n### Technical Details\n- Runtime override merges now block reserved prototype keys during deep merge.\n- Runtime override writes now sanitize nested object values to remove reserved prototype keys before storing overrides.\n- Restricted command gates (`bash`, `config`, `debug`) now require own-property boolean flags, preventing inherited prototype values from enabling commands.\n\n### Fix Commit(s)\n- `fbb79d4013000552d6a2c23b9613d8b3cb92f6b6`\n\n### Release Process Note\n`patched_versions` is pre-set to `2026.2.21` so after the npm release is live, this advisory can be published immediately.\n\nOpenClaw thanks @tdjackey for reporting.","published":"2026-03-18T01:34:27.872Z","modified":"2026-08-12T03:51:08.615423087Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"npm","name":"openclaw","fixedVersion":"2026.2.21"}],"fix":{"url":"https://github.com/openclaw/openclaw/commit/fbb79d4013000552d6a2c23b9613d8b3cb92f6b6","label":"openclaw/openclaw@fbb79d4"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27524.json"},{"type":"ADVISORY","url":"https://github.com/openclaw/openclaw/security/advisories/GHSA-62f6-mrcj-v8h5"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-27524"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/openclaw-prototype-pollution-via-debug-override-path"},{"type":"FIX","url":"https://github.com/openclaw/openclaw/commit/fbb79d4013000552d6a2c23b9613d8b3cb92f6b6"},{"type":"PACKAGE","url":"https://github.com/openclaw/openclaw"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:08.615423087Z"}}