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CVE-2026-35665

OpenClaw < 2026.3.24 - Denial of Service via Feishu Webhook Pre-Auth Body Parsing

Published: Apr 10, 2026Updated: Apr 10, 2026 Sources: CVE List
NVD MITRE
5.3CVSS
MEDIUM

OpenClaw before 2026.3.24 contains an incomplete fix for CVE-2026-32011 where the Feishu webhook handler accepts request bodies with permissive limits of 1MB and 30-second timeout before signature verification. An unauthenticated attacker can exhaust server connection resources by sending concurrent slow HTTP POST requests to the Feishu webhook endpoint, blocking legitimate webhook deliveries.

EPSS Score
0.0%
Top 88.1%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:L
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:LAvailability
Low

Weaknesses

CWE-405CWE-405 Asymmetric Resource Consumption (Amplification)

Affected Products

OpenClaw
OpenClaw

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

References

https://github.com/openclaw/openclaw/security/advisories/GHSA-w6m8-cqvj-pg5v
github.com
https://www.vulncheck.com/advisories/openclaw-denial-of-service-via-feishu-webhook-pre-auth-body-parsing
vulncheck.com

Timeline

Published
Apr 10, 2026
Last Updated
Apr 10, 2026

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