Vulnerability Report

CVE-2026-35626

Title: Unauthenticated Resource Exhaustion in Voice Call Webhooks

DoS

Proof Of Concept

No public PoC currently indexed for CVE-2026-35626.

CWE Category CWE-405

Published Date Apr 09, 2026

Modified Date Apr 15, 2026

Exploit Status Not Found

Score 6.9 CVSS v4.0

Exploit Probability (EPSS)

0.49%

Vulnerability Summary

CVE-2026-35626: OpenClaw before 2026.3.22 contains an unauthenticated resource exhaustion vulnerability in voice call webhook handling that buffers request bodies before provider signature checks. Attackers can send large or malicious webhook requests to exhaust server resources without authentication by bypassing signature validation.

Impacted Vendors

openclaw 1

Reference Links

https://github.com/openclaw/openclaw/commit/630f1479c44f78484dfa21bb407cbe6f171dac87 https://github.com/openclaw/openclaw/commit/651dc7450b68a5396a009db78ef9382633707ead https://github.com/openclaw/openclaw/security/advisories/GHSA-rm59-992w-x2mv https://www.vulncheck.com/advisories/openclaw-unauthenticated-resource-exhaustion-via-voice-call-webhook

CVSS v4.0

Source Entity [email protected]

Severity MEDIUM

6.9

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

N/A

RAW VECTOR

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1

Source Entity [email protected]

Severity MEDIUM

5.3

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

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

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2026-35626 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

April 15, 2026 MODIFIED

Vulnerability data updated via NVD.

April 15, 2026 MODIFIED

Vulnerability data updated via NVD.

April 13, 2026 MODIFIED

Vulnerability data updated via NVD.

April 09, 2026 MODIFIED

Vulnerability data updated via NVD.

Attack Vector Matrix

Access Vector NETWORK

Complexity LOW

Privileges N/A

Interaction NONE

CVSS Vector String


                                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected Stack

No specific products linked.