🛡️ CVE-2026-29046 — tinyweb

🟠 CVSS 8.2 — High ⚠️ Exploit Public CWE-20 NVD
8.2
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity high, availability low.

Weakness class

CVE-2026-29046 is classified as CWE-20: Improper Input Validation. The application accepts input without checking that it has the expected form, so malformed values reach code that assumes they are well formed.

Affected software

CVE-2026-29046 is recorded against 1 package.

  • tinyweb (fixed in 2.04)

Timeline and source

Published on 6 March 2026 and last revised on 17 June 2026. A public exploit is known to exist, which raises the urgency of patching considerably. A vendor advisory or fix has been published. Record sourced from NVD.

References

github.com
github.com

Details

Severity HIGH
CVSS Score 8.2
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L
CWE CWE-20
Public Exploit ⚠️ Yes
Source NVD
Published 2026-03-06
Updated 2026-08-11
Modified 2026-06-17

Affected Packages

Software From version Fixed in
tinyweb — 2.04

Similar Threats

Exploit Protection

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