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TI-2026-27741 Aliases CVE-2026-35640GHSA-3h52-cx59-c456

OpenClaw < 2026.3.25 - Denial of Service via Unauthenticated Webhook Request Parsing

Priority LOW 37CWE-696Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · Low
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-400.

Summary

OpenClaw before 2026.3.25 parses JSON request bodies before validating webhook signatures, allowing unauthenticated attackers to force resource-intensive parsing operations. Remote attackers can send malicious webhook requests to trigger denial of service by exhausting server resources through forced JSON parsing before signature rejection.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00453 39th percentileScored 2026-11-07
Fix Fixed OpenClaw (OpenClaw): 2026.3.25openclaw (npm): 2026.3.28

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
OpenClawOpenClawbefore 2026.3.252026.3.25Patch availableCNA
—openclaw (npm)before 2026.3.282026.3.28Patch availableGHSA-3h52-cx59-c456
  • OpenClaw VendorOpenClaw Affected before 2026.3.25 Fixed in 2026.3.25 Patch available CNA
  • openclaw (npm) Vendor— Affected before 2026.3.28 Fixed in 2026.3.28 Patch available GHSA-3h52-cx59-c456

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:openclaw:openclaw:*:*:*:*:*:node.js:*:*before 2026.3.25VulnerableOpenClaw
  • cpe:2.3:a:openclaw:openclaw:*:*:*:*:*:node.js:*:* Versions before 2026.3.25 Vulnerable ·OpenClaw

Remediation

  • Fix · CNA OpenClaw (OpenClaw) Fixed in 2026.3.25
  • Fix · GHSA-3h52-cx59-c456 openclaw (npm) Fixed in 2026.3.28 Advisory →

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    OpenClaw 2026.3.25

    11 records Highest priority Priority LOW 11 LOW

    Other records, highest priority first

    • TI-2026-27726 OpenClaw < 2026.3.25 - Privilege Escalation via Silent Local Shared-Auth ReconnectPriority LOW 38
    • TI-2026-26762 OpenClaw < 2026.3.25 - Improper Access Control in /sessions/:sessionKey/kill EndpointPriority LOW 34
    • TI-2026-27737 OpenClaw 2026.3.11 < 2026.3.25 - Session Isolation Bypass via sessionId ResolutionPriority LOW 31
    Show all 11 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-35640
  2. 2026-10-03 Alias added: GHSA-3h52-cx59-c456
  3. 2026-10-25 EPSS moved to the below the 50th percentile

References

Patch 1

Advisory 2

Other 1

  • TI-2026-25309 OpenClaw < 2026.3.28 Media Parsing Path Traversal to Arbitrary File Read CVSS 4.0HIGH 8.7
  • TI-2026-20394 Exposure of resource to wrong sphere in OpenClaw CVSS 3.1HIGH 8.8
  • TI-2026-27742 OpenClaw < 2026.3.24 - Arbitrary Code Execution via .npmrc in Local Plugin/Hook Installation CVSS 4.0HIGH 8.4
  • TI-2026-27766 OpenClaw < 2026.3.24 - Denial of Service via Feishu Webhook Pre-Auth Body Parsing CVSS 4.0MEDIUM 6.9
  • TI-2026-07315 OpenClaw bluebubbles Webhook monitor.ts handleBlueBubblesWebhookRequest improper authentication CVSS 4.0MEDIUM 6.9
  • TI-2026-17789 OpenClaw < 2026.2.22 - Allowlist Bypass via Command Substitution in system.run CVSS 4.0HIGH 7.5
See all 574 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences