CVE-2026-28497 CRITICAL

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

Vendor Maximmasiutin
Product TinyWeb
Weakness CWE-190
Published March 6, 2026
Last update March 6, 2026

CVSS base score

9.3/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality
Integrity

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

March 6, 2026 CVE published
March 6, 2026 Record updated