CVE-2026-27524
OpenClaw < 2026.2.21 - Prototype Pollution via Debug Override Path
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
OpenClaw < 2026.2.21 - Prototype Pollution via Debug Override Path
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.
- Record
CVE-2026-27524- CVSS 4.0
- 2.3 Low
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 - CVSS 3.1
- 4.3 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N - Weakness
- CWE-1321
- Updated
- 2026-11-02
EUVDEUVD-2026-12736
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.
- Record
EUVD-2026-12736- CVSS 4.0
- 2.3 Low
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 - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-62f6-mrcj-v8h5
OpenClaw's runtime /debug override path accepted prototype-reserved keys
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.
- Record
GHSA-62f6-mrcj-v8h5- CVSS 4.0
- 2.0 Low
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 - Weakness
- CWE-1321
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2026-27524- CVSS 4.0
- 2.3 Low
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 - CVSS 3.1
- 4.3 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N - Weakness
- CWE-1321
- Updated
- 2026-11-02
OSV
OpenClaw < 2026.2.21 - Prototype Pollution via Debug Override Path
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.
- Record
CVE-2026-27524- CVSS 4.0
- 2.3 Low
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 - Weakness
- CWE-1321
- Updated
- 2026-11-02
OSVGHSA-62f6-mrcj-v8h5
OpenClaw's runtime /debug override path accepted prototype-reserved keys
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.
- Record
GHSA-62f6-mrcj-v8h5- CVSS 4.0
- 2.0 Low
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 - Weakness
- CWE-1321
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
openclawnpm |
before 2026.2.21 | 2026.2.21 |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-27524 is a low vulnerability (CVSS 2.3) in Openclaw, published March 3, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.25%, the 16th percentile. Fixed in openclaw 2026.2.21.
References
github.com/openclaw/openclaw/security/advisories/GHSA-62f6-mrcj-v8h5
vulncheck.com/advisories/openclaw-prototype-pollution-via-debug-override-path
nvd.nist.gov/vuln/detail/CVE-2026-27524