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CVE-2026-27633— TinyWeb has Unbounded Content-Length Memory Exhaustion (DoS)

Quick assessment

Affected
maximmasiutin TinyWeb
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

TinyWeb是Konstantin Belyalov个人开发者的一个简单且轻量级 HTTP 服务器。 TinyWeb 2.02之前版本存在资源管理错误漏洞，该漏洞源于未限制HTTP请求主体大小，可能导致内存耗尽和服务器崩溃。

AI Predicted 5.3 Difficulty: Trivial EPSS 0.82% · P56

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-27633

Vulnerability Information
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Vulnerability Title
TinyWeb has Unbounded Content-Length Memory Exhaustion (DoS)
Source: CVE Program / CVE List V5
Vulnerability 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).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
TinyWeb 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
TinyWeb是Konstantin Belyalov个人开发者的一个简单且轻量级 HTTP 服务器。 TinyWeb 2.02之前版本存在资源管理错误漏洞，该漏洞源于未限制HTTP请求主体大小，可能导致内存耗尽和服务器崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
maximmasiutin TinyWeb < 2.02 -

II. Public POCs for CVE-2026-27633

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III. Intelligence Information for CVE-2026-27633

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Patches & Fixes for CVE-2026-27633 (1)

News Coverage for CVE-2026-27633 (1)

Same Patch Batch · maximmasiutin · 2026-02-25 · 3 CVEs total

CVE-2026-27613 CGI Parameter Injection (Bypass of STRICT_CGI_PARAMS and EscapeShellParam)
CVE-2026-27630 TinyWeb vulnerable to Remote Denial of Service via Thread/Connection Exhaustion (Slowloris

IV. Related Vulnerabilities

Same product: TinyWeb
Same vendor: maximmasiutin
Same weakness: CWE-400

V. Comments for CVE-2026-27633

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