CVE-2026-28497 PUBLISHED

TinyWeb: Integer Overflow in `_Val` (HTTP Request Smuggling)

Assigner: GitHub_M
Reserved: 27.02.2026 Published: 06.03.2026 Updated: 06.03.2026

TinyWeb is a web server (HTTP, HTTPS) written in Delphi for Win32. Prior to version 2.03, an integer overflow vulnerability in the string-to-integer conversion routine (_Val) allows an unauthenticated remote attacker to bypass Content-Length restrictions and perform HTTP Request Smuggling. This can lead to unauthorized access, security filter bypass, and potential cache poisoning. The impact is critical for servers using persistent connections (Keep-Alive). This issue has been patched in version 2.03.

Metrics

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
CVSS Score: 9.3

Product Status

Vendor maximmasiutin
Product TinyWeb
Versions
  • Version < 2.03 is affected

References

Problem Types

  • CWE-190: Integer Overflow or Wraparound CWE
  • CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') CWE