Is this vulnerability remotely exploitable over the internet?

Yes. An attacker only needs network-level access to send crafted HTTP/HTTPS requests to a TinyWeb server; no prior authentication is required. Exploitability increases in environments where TinyWeb is part of a chain with proxies or caches.

What level of access does an attacker need to take advantage of this issue?

The attacker requires the ability to open HTTP or HTTPS connections to the TinyWeb instance and control request headers and bodies. No local access or credentials are necessary, although internal services may also be at risk if exposed over HTTP.

What is the safest general fix pattern for addressing this class of bug?

Adopt strict, overflow-aware numeric parsing for all length and size headers, enforce clear upper bounds on request body sizes, and reject any request that cannot be parsed unambiguously. Additionally, align HTTP parsing behavior across all components (server, proxies, caches) to avoid desynchronization.

Severity:

CRITICAL RISK

(9.1)

Integer Overflow Request Length Handling (CWE-190/CWE-444) in TinyWeb HTTP Server

CVE-2026-28497

Published:

Mar 5, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

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

Privilege Escalation via Bypassed Access Control

May 6, 2026

Vulnerability Type

Category:

HTTP Request Smuggling via Integer Overflow

CWE:

CWE-190;CWE-444

Impact:

HTTP Request Smuggling and Security Control Bypass

Severity:

CRITICAL RISK

(9.1)

CVSS Version:

3.1

Vulnerability Type

Category:

HTTP Request Smuggling via Integer Overflow

CWE:

CWE-190;CWE-444

Impact:

HTTP Request Smuggling and Security Control Bypass

Severity:

CRITICAL RISK

(9.1)

CVSS Version:

3.1

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Integer Overflow Request Length Handling (CWE-190/CWE-444) in TinyWeb HTTP Server

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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