Skip to main content
VulnerabilityPublished

CVE-2026-29046: maximmasiutin TinyWeb · Process Control

Affects maximmasiutin TinyWebSource CVE Database V5

0
Compare

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

CVSS 4.0 base score
9.2Critical
How severe the flaw is on the 0–10 CVSS scale.

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:L

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 6 Mar 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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

ProductAffectedFixed in
maximmasiutinTinyWebAffected
  • <2.04
Fixed in
  • 2.04
GitHubmaximmasiutin/TinyWebpkg:github/maximmasiutin/TinyWebOther threatsAffected
  • <2.04
Fixed in
  • 2.04

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

  1. Immediately upgrade TinyWeb to version 2.04 or later, where the vulnerability is patched.
  2. 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.
  3. Audit and sanitize all CGI environment variables rigorously to ensure no unsafe data is processed by CGI scripts.
  4. Employ strict input validation and output encoding in all CGI scripts to mitigate injection risks.
  5. Monitor web server logs for anomalous header values or unusual CGI environment variable content indicative of exploitation attempts.
  6. Restrict the privileges of the TinyWeb process to the minimum necessary to limit potential damage from exploitation.
  7. Consider isolating TinyWeb instances in segmented network zones to reduce lateral movement risk.
  8. 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.

References

Community reviews

Loading reviews…