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CRITICALCVE-2026-29046Published Modified CNA GitHub_M

CVE-2026-29046: TinyWeb: HTTP Header Control Character Injection into CGI Environment

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.

Metrics

CVSS v4.0
9.2
Severity
CRITICAL
Fixed in
Affected Products
1
Affected packages
  • maximmasiutin / TinyWeb
    < 2.04
CVSS Vector
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