CVE-2026-35640

MEDIUM

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

Title source: cna

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.

References (3)

[Third Party Advisory] https://github.com/openclaw/openclaw/security/advisories/GHSA-3h52-cx59-c456

[Patch] https://github.com/openclaw/openclaw/commit/5e8cb22176e9235e224be0bc530699261eb60e53

View Patch ZIP pw:eip

[Third Party Advisory] https://www.vulncheck.com/advisories/openclaw-denial-of-service-via-unauthenticated-webhook-request-parsing

Scores

CVSS v3 5.3

EPSS 0.0012

EPSS Percentile 30.1%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Details

CWE

CWE-696

Status published

Products (4)

npm/openclaw 0 - 2026.3.28npm

OpenClaw/OpenClaw < 2026.3.25

openclaw/openclaw < 2026.3.25

OpenClaw/OpenClaw 2026.3.25

Published Apr 09, 2026

Tracked Since Apr 10, 2026