CVE-2026-29046: maximmasiutin TinyWeb · Process Control
Affects maximmasiutin TinyWebSource CVE Database V5
Not known to be exploited · CVSS 9.2 Critical : upgrade to 2.04 as a priority.
Data as of 30 Oct 2026, 11:52 UTC
Contested
Critical score, yet low EPSS after six months- EPSS
- 0.4% chance of exploitation in 30 days – higher than 34% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 2.04
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:L/SC:N/SI:H/SA:LExploitation evidence
Disclosed: evidence found.
CVE published 6 Mar 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.
What to do
Upgrade TinyWeb and maximmasiutin/TinyWeb to 2.04.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| maximmasiutinTinyWeb | Affected
| Fixed in
|
GitHubmaximmasiutin/TinyWebpkg:github/maximmasiutin/TinyWebOther threats | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
- Immediately upgrade TinyWeb to version 2.04 or later, where the vulnerability is patched.
- If upgrading is not immediately possible, implement network-level controls such as web application firewalls (WAFs) to detect and block suspicious HTTP headers containing control characters or encoded equivalents.
- Audit and sanitize all CGI environment variables rigorously to ensure no unsafe data is processed by CGI scripts.
- Employ strict input validation and output encoding in all CGI scripts to mitigate injection risks.
- Monitor web server logs for anomalous header values or unusual CGI environment variable content indicative of exploitation attempts.
- Restrict the privileges of the TinyWeb process to the minimum necessary to limit potential damage from exploitation.
- Consider isolating TinyWeb instances in segmented network zones to reduce lateral movement risk.
- Educate developers and administrators about the risks of improper header parsing and the importance of timely patching.
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.