CVE-2026-29046 Details
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.
A vulnerability exists in TinyWeb versions prior to 2.04, where the web server's HTTP header parser fails to properly sanitize header values before they are mapped to CGI environment variables. The parser allows dangerous control characters, such as carriage return (CR), line feed (LF), and null (NUL) bytes, to be injected. Additionally, encoded forms of these characters, like '%0d', '%0a', and '%00', are not consistently rejected. This lack of proper validation can lead to header value confusion across parser boundaries, creating the potential for unsafe data to be introduced into the CGI execution context.
Users can update to TinyWeb version 2.04 or later, where this vulnerability has been fixed. The patch is available in the official TinyWeb repository.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Mar 6, 2026References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-114 | Process Control | [email protected] |
| CWE-20 | Improper Input Validation | [email protected] |
| CWE-74 | Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') | [email protected] |
| CWE-93 | Improper Neutralization of CRLF Sequences ('CRLF Injection') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| ritlabs tinyweb | < 2.04 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Mar 16, 2026 | Initial Analysis | [email protected] |
| Mar 6, 2026 | New CVE Received | [email protected] |