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CVE-2026-28497— TinyWeb: Integer Overflow in `_Val` (HTTP Request Smuggling)

Quick assessment

Affected
maximmasiutin TinyWeb
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

TinyWeb是Konstantin Belyalov个人开发者的一个简单且轻量级 HTTP 服务器。 TinyWeb 2.03之前版本存在环境问题漏洞，该漏洞源于字符串到整数转换例程存在整数溢出，可能导致绕过Content-Length限制并执行HTTP请求夹带攻击。

AI Predicted 9.8 Difficulty: Easy EPSS 0.67% · P50
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I. Basic Information for CVE-2026-28497

Vulnerability Information
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Vulnerability Title
TinyWeb: Integer Overflow in `_Val` (HTTP Request Smuggling)
Source: CVE Program / CVE List V5
Vulnerability Description
TinyWeb is a web server (HTTP, HTTPS) written in Delphi for Win32. Prior to version 2.03, an integer overflow vulnerability in the string-to-integer conversion routine (_Val) allows an unauthenticated remote attacker to bypass Content-Length restrictions and perform HTTP Request Smuggling. This can lead to unauthorized access, security filter bypass, and potential cache poisoning. The impact is critical for servers using persistent connections (Keep-Alive). This issue has been patched in version 2.03.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
整数溢出或超界折返
Source: CVE Program / CVE List V5
Vulnerability Title
TinyWeb 环境问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
TinyWeb是Konstantin Belyalov个人开发者的一个简单且轻量级 HTTP 服务器。 TinyWeb 2.03之前版本存在环境问题漏洞，该漏洞源于字符串到整数转换例程存在整数溢出，可能导致绕过Content-Length限制并执行HTTP请求夹带攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
maximmasiutin TinyWeb < 2.03 -

II. Public POCs for CVE-2026-28497

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III. Intelligence Information for CVE-2026-28497

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Patches & Fixes for CVE-2026-28497 (1)

Vendor Advisories for CVE-2026-28497 (1)

IV. Related Vulnerabilities

Same product: TinyWeb
Same vendor: maximmasiutin
Same weakness: CWE-190

V. Comments for CVE-2026-28497

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