Is this vulnerability remotely exploitable over the internet?

Yes, if an attacker can act as or influence the Hex registry or mirror that the client connects to, including via man-in-the-middle scenarios. The exploit vector is through crafted HTTP responses to the affected API client functions.

Does an attacker need local access to my system?

No local system access is required. Control over the registry responses or the network path is sufficient, though in many setups that control is restricted by TLS, DNS integrity, and registry access controls.

What is the safest general fix pattern for this issue?

The safest pattern is to treat all registry responses as untrusted data: use strictly data-oriented parsing, validate against clear schemas, and apply hard limits on payload size and structural complexity before constructing in-memory terms.

Severity:

HIGH RISK

(7.5)

Uncontrolled Resource Consumption & Unsafe Deserialization (CWE-400, CWE-502) in Hex API Clients

CVE-2026-21619

Published:

Feb 27, 2026

Status:

Modified

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-918

HIGH RISK

HIGH

(8.6)

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Unauthorized Access to Internal Resources via SSRF

May 6, 2026

CWE-863

HIGH RISK

HIGH

(8.8)

Authorization Bypass (CWE-863) in OpenClaw Matrix Room Control Commands

Privilege Escalation via Bypassed Access Control

May 6, 2026

Vulnerability Type

Category:

Unsafe Deserialization and Resource Exhaustion

CWE:

CWE-400;CWE-502

Impact:

Denial of Service and Potential Object Injection

Severity:

HIGH RISK

(7.5)

CVSS Version:

3.1

Vulnerability Type

Category:

Unsafe Deserialization and Resource Exhaustion

CWE:

CWE-400;CWE-502

Impact:

Denial of Service and Potential Object Injection

Severity:

HIGH RISK

(7.5)

CVSS Version:

3.1

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From first line of code to a pentest
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Uncontrolled Resource Consumption & Unsafe Deserialization (CWE-400, CWE-502) in Hex API Clients

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(8.6)

Server-Side Request Forgery (CWE-918) in OpenClaw Zalo Plugin sendPhoto

HIGH RISK

HIGH

(8.8)

Authorization Bypass (CWE-863) in OpenClaw Matrix Room Control Commands

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

Ship clean & secure code faster

Ship clean & secure code faster

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