TI-2026-22760 Aliases CVE-2026-28497

TinyWeb: Integer Overflow in `_Val` (HTTP Request Smuggling)

MEDIUM 47CWE-190Published 2026-03-06 · Updated 2026-03-06

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Code execution
Confidentiality · integrity · availability: High · High · None
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-190 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00531 45th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed TinyWeb (maximmasiutin): 2.03

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
maximmasiutin	TinyWeb	before 2.03	2.03	Patch available	CNA

TinyWeb Vendormaximmasiutin Affected before 2.03 Fixed in 2.03 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:ritlabs:tinyweb::::::::	before 2.03	Vulnerable	maximmasiutin

cpe:2.3:a:ritlabs:tinyweb:*:*:*:*:*:*:*:* Versions before 2.03 Vulnerable ·maximmasiutin

Remediation

Fix · CNA TinyWeb (maximmasiutin) Fixed in 2.03

Timeline

2026-10-02 Threatist record created from CVE-2026-28497
2026-10-25 EPSS moved to the below the 50th percentile

References

Exploit 1

https://github.com/maximmasiutin/TinyWeb/security/advisories/GHSA-rp8j-cx7r-mw9f

Patch 1

https://github.com/maximmasiutin/TinyWeb/commit/d2edd0322c3d74beee0a6c0191299b8946695d4e

TI-2024-04819 Ritlabs TinyWeb Server Request crlf injection CVSS 4.0MEDIUM 6.9
TI-2026-18299 TinyWeb CGI Command Injection CVSS 4.0CRITICAL 10.0
TI-2026-21999 CGI Parameter Injection (Bypass of STRICT_CGI_PARAMS and EscapeShellParam) CVSS 4.0CRITICAL 10.0
TI-2026-23191 TinyWeb: HTTP Header Control Character Injection into CGI Environment CVSS 4.0CRITICAL 9.2
TI-2024-22622 TinyWeb 1.94 and below allows unauthenticated remote attackers to cause a denial of… CVSS 3.1HIGH 8.6
TI-2026-22015 TinyWeb has Unbounded Content-Length Memory Exhaustion (DoS) CVSS 4.0HIGH 8.7

See all 7 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences