TI-2026-23191 Aliases CVE-2026-29046

TinyWeb: HTTP Header Control Character Injection into CGI Environment

MEDIUM 46CWE-114Published 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: —
Confidentiality · integrity · availability: None · High · Low
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

TinyWeb 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 into CGI environment variables (HTTP_*). The parser did not strictly reject dangerous control characters in header lines and header values, including CR, LF, and NUL, and did not consistently defend against encoded forms such as %0d, %0a, and %00. This can enable header value confusion across parser boundaries and may create unsafe data in the CGI execution context. This issue has been patched in version 2.04.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.0044 38th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed TinyWeb (maximmasiutin): 2.04

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 2.04	2.04	Patch available	CNA

TinyWeb Vendormaximmasiutin Affected before 2.04 Fixed in 2.04 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:ritlabs:tinyweb::::::::	before 2.04	Vulnerable	maximmasiutin

cpe:2.3:a:ritlabs:tinyweb:*:*:*:*:*:*:*:* Versions before 2.04 Vulnerable ·maximmasiutin

Remediation

Fix · CNA TinyWeb (maximmasiutin) Fixed in 2.04

Timeline

2026-10-02 Threatist record created from CVE-2026-29046

References

Exploit 1

https://github.com/maximmasiutin/TinyWeb/security/advisories/GHSA-r3gf-pg2c-m7mc

Patch 1

https://github.com/maximmasiutin/TinyWeb/commit/53aa8b6e5146491d7be57920e3fc50d7a34e4d5a

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-2026-22760 TinyWeb: Integer Overflow in `_Val` (HTTP Request Smuggling) CVSS 4.0CRITICAL 9.3
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