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Vulnerability record · CVE-2026-28497 · published 6 March 2026

CVE-2026-28497: Ritlabs tinyweb integer overflow vulnerability

Ritlabs · Tinyweb

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.

9.3 CVSS 4.0 Critical EPSS 0.67% · top 50.2% CWE-190 · Integer overflowCWE-444 · HTTP request smuggling
9.3CVSS 4.0 base score
0.67%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 1 tagged exploit
17 Jun 2026Last modified by NVD

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.

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/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:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/maximmasiutin/TinyWeb/commit/d2edd0322c3d74beee0a6c0191299b8946695d4e Patch
https://github.com/maximmasiutin/TinyWeb/security/advisories/GHSA-rp8j-cx7r-mw9f ExploitVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2026-27613Ritlabs tinyweb os command injection vulnerabilityTinyWeb is a web server (HTTP, HTTPS) written in Delphi for Win32. A vulnerability in versions prior to 2.01 allows unauthenticated remote attackers …EPSS 1.4%10.0CVE-2026-22781Ritlabs tinyweb os command injection vulnerabilityTinyWeb is a web server (HTTP, HTTPS) written in Delphi for Win32. TinyWeb HTTP Server before version 1.98 is vulnerable to OS command injection via …EPSS 2.5%9.2CVE-2026-29046Ritlabs tinyweb improper input validation vulnerabilityTinyWeb is a web server (HTTP, HTTPS) written in Delphi for Win32. Prior to version 2.04, TinyWeb accepts request header values and later maps them i…EPSS 0.56%8.7CVE-2026-27633Ritlabs tinyweb uncontrolled resource consumption vulnerabilityTinyWeb is a web server (HTTP, HTTPS) written in Delphi for Win32. Versions prior to version 2.02 have a Denial of Service (DoS) vulnerability via me…EPSS 0.82%8.7CVE-2026-27630Ritlabs tinyweb uncontrolled resource consumption vulnerabilityTinyWeb is a web server (HTTP, HTTPS) written in Delphi for Win32. Versions prior to version 2.02 are vulnerable to a Denial of Service (DoS) attack …EPSS 0.82%8.6CVE-2024-34199Ritlabs tinyweb out-of-bounds write vulnerabilityTinyWeb 1.94 and below allows unauthenticated remote attackers to cause a denial of service (Buffer Overflow) when sending excessively large elements…EPSS 1.2%5.5CVE-2024-5193Ritlabs tinyweb injection vulnerabilityA security vulnerability has been detected in Ritlabs TinyWeb Server 1.94. This vulnerability affects unknown code of the component Request Handler. …EPSS 0.66%8.4CVE-2025-48595Android Framework integer overflow enables local code executionAn integer overflow in multiple locations of the Android Framework can be turned into code execution. It allows a local attacker to escalate privileg…KEVEPSS 1.7%analysed

Source: NIST National Vulnerability Database (record CVE-2026-28497), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.