TI-2026-18299 Aliases CVE-2026-22781

TinyWeb CGI Command Injection

MEDIUM 53CWE-78Published 2026-01-12 · Updated 2026-01-12

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 · High
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-78.

Summary

TinyWeb 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 CGI ISINDEX-style query parameters. The query parameters are passed as command-line arguments to the CGI executable via Windows CreateProcess(). An unauthenticated remote attacker can execute arbitrary commands on the server by injecting Windows shell metacharacters into HTTP requests. This vulnerability is fixed in 1.98.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.02438 84th percentileScored 2026-11-07

Fix Fixed TinyWeb (maximmasiutin): 1.98

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Total

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 1.98	1.98	Patch available	CNA

TinyWeb Vendormaximmasiutin Affected before 1.98 Fixed in 1.98 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:ritlabs:tinyweb::::::::	before 1.98	Vulnerable	maximmasiutin

cpe:2.3:a:ritlabs:tinyweb:*:*:*:*:*:*:*:* Versions before 1.98 Vulnerable ·maximmasiutin

Remediation

Fix · CNA TinyWeb (maximmasiutin) Fixed in 1.98

Timeline

2026-10-02 Threatist record created from CVE-2026-22781

References

Patch 1

https://github.com/maximmasiutin/TinyWeb/commit/876b7e2887f4ea5be3e18bb2af7313f23a283c96

Advisory 2

TI-2024-04819 Ritlabs TinyWeb Server Request crlf injection CVSS 4.0MEDIUM 6.9
TI-2026-21999 CGI Parameter Injection (Bypass of STRICT_CGI_PARAMS and EscapeShellParam) CVSS 4.0CRITICAL 10.0
TI-2026-22760 TinyWeb: Integer Overflow in `_Val` (HTTP Request Smuggling) CVSS 4.0CRITICAL 9.3
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