by Kastro
Paper/Archive/CVE-2026-29046

CVE-2026-29046

maximmasiutin TinyWeb — TinyWeb: HTTP Header Control Character Injection into CGI Environment

EPSS 0.4%CVSS 9.2
critical.is priorityof 100
35
CVSS 9.2 (CNA)9.2 / 10 × 3027.6Not in CISA KEV+300.0EPSS percentile 34.5.345 × 206.9No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
TinyWeb< 2.04–CNA

Scores by source

GitHub_M (CNA)9.2CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:L/SC:N/SI:H/SA:L
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: partial

References

refgithub.com/maximmasiutin/TinyWeb/security/advisories/GHSA-r3gf-pg2c-m7mcrefgithub.com/maximmasiutin/TinyWeb/commit/53aa8b6e5146491d7be57920e3fc50d7a34e4d5a