Home/CVE/OpenClaw before 2026.3.25 parses JSON request bodies before validating webhook signatures, allowing unauthenticated atta
CVE

CVE-2026-35640

OpenClaw before 2026.3.25 parses JSON request bodies before validating webhook signatures, allowing unauthenticated atta

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.

MEDIUM · CVSS 5.3 EPSS 0.00127
Schedule remediation
  • SSVC automatable: yes - attacks can be scripted at scale
Sigma rules0 YARA rules0
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Weakness Classification

CWE-696Incorrect Behavior Order
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Affected Products & Versions

1
openclaw< 2026.3.25
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Affected Packages

1
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
npm openclaw MODERATE fixed in 2026.3.28
▣

Scoring & Timeline

5.3
MEDIUM · CVSS v3.1 · disclosure@vulncheck.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD09 Apr 2026 · 10:16 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
yes
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
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References & Sources

3
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/openclaw/openclaw/commit/5e8cb22176e9235e224be0bc530699261eb60e53Patch
https://github.com/openclaw/openclaw/security/advisories/GHSA-3h52-cx59-c456Vendor Advisory
https://www.vulncheck.com/advisories/openclaw-denial-of-service-via-unauthenticated-webhook-request-parsingThird Party Advisory
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