CVE-2026-35640

MEDIUM

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

Title source: cna
STIX 2.1

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)

Core 3
Core References
Third Party Advisory third-party-advisory
GitHub Security Advisory (GHSA-3h52-cx59-c456)
https://github.com/openclaw/openclaw/security/advisories/GHSA-3h52-cx59-c456
Third Party Advisory third-party-advisory
VulnCheck Advisory: OpenClaw < 2026.3.25 - Denial of Service via Unauthenticated Webhook Request Parsing
https://www.vulncheck.com/advisories/openclaw-denial-of-service-via-unauthenticated-webhook-request-parsing

Scores

CVSS v3 5.3
EPSS 0.0044
EPSS Percentile 34.7%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

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