CVE-2026-29046

TinyWeb: HTTP Header Control Character Injection into CGI Environment

State: Published
Severity: 9.2 Critical
Published: Mar 6, 2026
Updated: Mar 6, 2026
Reserved: Mar 3, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	9.2 Critical	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:L/SC:N/SI:H/SA:L	GitHub_M

Weaknesses

CWE-114 Process Control
CWE-20 Improper Input Validation
CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
CWE-93 Improper Neutralization of CRLF Sequences ('CRLF Injection')

Affected Products

Product	Versions
TinyWebmaximmasiutin	< 2.04Affected

References

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