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OpenClaw: denial of service through large base64 media files allocating large buffers before limit checks

Moderate severity GitHub Reviewed Published Feb 15, 2026 in openclaw/openclaw • Updated Feb 18, 2026

Package

npm clawdbot (npm)

Affected versions

<= 2026.1.24-3

Patched versions

None
npm openclaw (npm)
< 2026.2.14
2026.2.14

Description

Summary

Base64-backed media inputs could be decoded into Buffers before enforcing decoded-size budgets. An attacker supplying oversized base64 payloads can force large allocations, causing memory pressure and denial of service.

Attack Scenario Notes

  • Recommended deployments bind the gateway to loopback by default and require gateway auth for HTTP endpoints. In that configuration, this is best modeled as a local/authorized DoS.
  • If an operator exposes the gateway to untrusted networks (or disables/weakens auth and rate limits), treat this as a higher-severity network DoS risk.

Affected Packages / Versions

  • openclaw (npm): <= 2026.2.13
  • clawdbot (npm): <= 2026.1.24-3

Fixed In

  • openclaw (npm): 2026.2.14 (planned)
  • clawdbot (npm): no patched release planned; migrate to openclaw

Fix Commit(s)

  • 31791233d60495725fa012745dde8d6ee69e9595

Credits

Thanks @vincentkoc for reporting.

References

@steipete steipete published to openclaw/openclaw Feb 15, 2026
Published to the GitHub Advisory Database Feb 18, 2026
Reviewed Feb 18, 2026
Last updated Feb 18, 2026

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS score

Weaknesses

Uncontrolled Resource Consumption

The product does not properly control the allocation and maintenance of a limited resource. Learn more on MITRE.

CVE ID

No known CVE

GHSA ID

GHSA-w2cg-vxx6-5xjg

Source code

Credits

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