CVE-2026-28497CWE-190CWE-444

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

Critical · published March 6, 2026

CVSS v4.0
9.3
EPSS
1%
Percentile
52.3
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
9.3 · CRITICAL
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
EPSS
0.00692 · 52.3th percentile
Weaknesses
CWE-190 · Integer Overflow or Wraparound; CWE-444 · Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Published
2026-03-06T02:51Z
EPSS history
Timeline
  • 06 MAR 02:51Z
    TinyWeb: Integer Overflow in `_Val` (HTTP Request Smuggling)
    cvelistv5