CVE-2026-35640

Medium

Description

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.

SeverityMedium

CVSS5.3

Exploit probability—

ProductOpenclaw

PublishedApr 9, 2026

First seenApr 9, 2026

Weakness typeCWE-696CWE-696

How to fix

Update

openclaw openclaw2026.3.25 or later
openclaw2026.3.28 or later

Patches

github.com/openclaw/openclaw/commit/5e8cb22176e9235e224be0bc530699261eb60e53

Vendor advisories

github.com/openclaw/openclaw/security/advisories/GHSA-3h52-cx59-c456

Affected products

Product	Affected versions	Fixed in
openclaw openclaw	v < 2026.3.25	2026.3.25
openclawnpm	v < 2026.3.28	2026.3.28

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