{"id":"CVE-2026-27524","aliases":["EUVD-2026-12736","GHSA-62f6-mrcj-v8h5"],"status":"published","title":"OpenClaw \u003c 2026.2.21 - Prototype Pollution via Debug Override Path","description":"OpenClaw versions prior to 2026.2.21 accept prototype-reserved keys in runtime /debug set override object values, allowing prototype pollution attacks. Authorized /debug set callers can inject __proto__, constructor, or prototype keys to manipulate object prototypes and bypass command gate restrictions.","severity":{"version":"4.0","score":2.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","level":"low","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00251,"percentile":0.16603,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-1321"],"published":"2026-03-03T22:12:20Z","modified":"2026-10-28T02:31:11Z","fixes":[{"ecosystem":"npm","package":"openclaw","fixed_in":["2026.2.21"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"openclaw","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2026.2.21"}]}]},{"source":"osv","ecosystem":"npm","package":"openclaw","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2026.2.21"}]}]}],"products":[{"vendor":"openclaw","product":"openclaw"}],"references":[{"url":"https://github.com/openclaw/openclaw/security/advisories/GHSA-62f6-mrcj-v8h5","tags":["vendor-advisory","Vendor Advisory","advisory","web"]},{"url":"https://github.com/openclaw/openclaw/commit/fbb79d4013000552d6a2c23b9613d8b3cb92f6b6","tags":["patch","Patch","fix","web"]},{"url":"https://www.vulncheck.com/advisories/openclaw-prototype-pollution-via-debug-override-path","tags":["third-party-advisory","Third Party Advisory","advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-27524","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-62f6-mrcj-v8h5"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27524.json","tags":["advisory"]},{"url":"https://github.com/openclaw/openclaw","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-27524","title":"OpenClaw \u003c 2026.2.21 - Prototype Pollution via Debug Override Path","description":"OpenClaw versions prior to 2026.2.21 accept prototype-reserved keys in runtime /debug set override object values, allowing prototype pollution attacks. Authorized /debug set callers can inject __proto__, constructor, or prototype keys to manipulate object prototypes and bypass command gate restrictions.","status":"published","published":"2026-03-18T01:34:27.872Z","modified":"2026-06-23T16:14:08.98Z","cvss":[{"version":"4.0","score":2.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","level":"low","assessor":"cna"},{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-1321"],"updated_at":"2026-11-02T14:19:48.826324Z"}],"euvd":[{"id":"EUVD-2026-12736","description":"OpenClaw versions prior to 2026.2.21 accept prototype-reserved keys in runtime /debug set override object values, allowing prototype pollution attacks. Authorized /debug set callers can inject __proto__, constructor, or prototype keys to manipulate object prototypes and bypass command gate restrictions.","status":"published","published":"2026-03-18T01:34:27Z","modified":"2026-06-23T16:14:08Z","cvss":[{"version":"4.0","score":2.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","level":"low"}],"updated_at":"2026-11-02T18:20:32.768333Z"}],"ghsa":[{"id":"GHSA-62f6-mrcj-v8h5","title":"OpenClaw's runtime /debug override path accepted prototype-reserved keys","description":"### 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: `\u003c= 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.","status":"published","published":"2026-03-03T22:12:20Z","modified":"2026-03-18T21:51:57Z","cvss":[{"version":"4.0","score":2,"vector":"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","level":"low"}],"cwes":["CWE-1321"],"updated_at":"2026-11-02T14:39:37.554665Z"}],"nvd":[{"id":"CVE-2026-27524","description":"OpenClaw versions prior to 2026.2.21 accept prototype-reserved keys in runtime /debug set override object values, allowing prototype pollution attacks. Authorized /debug set callers can inject __proto__, constructor, or prototype keys to manipulate object prototypes and bypass command gate restrictions.","status":"published","published":"2026-03-18T02:16:23.627Z","modified":"2026-06-17T10:27:18.467Z","cvss":[{"version":"4.0","score":2.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"low","assessor":"secondary"},{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","level":"medium","assessor":"secondary"},{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-1321"],"updated_at":"2026-11-02T14:12:09.735529Z"}],"osv":[{"id":"CVE-2026-27524","title":"OpenClaw \u003c 2026.2.21 - Prototype Pollution via Debug Override Path","description":"OpenClaw versions prior to 2026.2.21 accept prototype-reserved keys in runtime /debug set override object values, allowing prototype pollution attacks. Authorized /debug set callers can inject __proto__, constructor, or prototype keys to manipulate object prototypes and bypass command gate restrictions.","status":"published","published":"2026-03-18T01:34:27.872Z","modified":"2026-10-28T02:31:11.473524821Z","cvss":[{"version":"4.0","score":2.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","level":"low"}],"cwes":["CWE-1321"],"updated_at":"2026-11-02T15:45:00.180685Z"},{"id":"GHSA-62f6-mrcj-v8h5","title":"OpenClaw's runtime /debug override path accepted prototype-reserved keys","description":"### 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: `\u003c= 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.","status":"published","published":"2026-03-03T22:12:20Z","modified":"2026-03-18T22:01:32.878233Z","cvss":[{"version":"4.0","score":2,"vector":"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","level":"low"}],"cwes":["CWE-1321"],"updated_at":"2026-11-02T15:46:38.911014Z"}]}}