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CVE-2026-27633

· Published 26/02/2026 00:16 · Modified 27/02/2026 14:06

Labels: CVE-2026-27633 2026-02-26CVE-2026-27633CWE-400[email protected]

Essential information

Published
26/02/2026 00:16
Modified
27/02/2026 14:06
Author
Creator
CVSS
8.7 HIGH (v3) 8.7 HIGH (v4.0)
CISA KEV
No
CWE
CVSS vector

CVSS metrics

Description

TinyWeb is a web server (HTTP, HTTPS) written in Delphi for Win32. Versions prior to version 2.02 have a Denial of Service (DoS) vulnerability via memory exhaustion. Unauthenticated remote attackers can send an HTTP POST request to the server with an exceptionally large `Content-Length` header (e.g., `2147483647`). The server continuously allocates memory for the request body (`EntityBody`) while streaming the payload without enforcing any maximum limit, leading to all available memory being consumed and causing the server to crash. Anyone hosting services using TinyWeb is impacted. Version 2.02 fixes the issue. The patch introduces a `CMaxEntityBodySize` limit (set to 10MB) for the maximum size of accepted payloads. As a temporary workaround if upgrading is not immediately possible, consider placing the server behind a Web Application Firewall (WAF) or reverse proxy (like nginx or Cloudflare) configured to explicitly limit the maximum allowed HTTP request body size (e.g., `client_max_body_size` in nginx).

NVD status

Status
Undergoing Analysis — CVE has been recently published to the CVE List and has been received by the NVD.
Source
[email protected]
NVD
View on NVD

Affected products (CPE)

ProductCPE
tinyweb / tinyweb cpe:2.3:a:tinyweb:tinyweb:<2.02:*:*:*:*:*:*:*

References