CVE-2026-27633

Katalog CVE

CVSS 7.5 · High EPSS 0,82%

Kerentanan Uncontrolled Resource Consumption pada ritlabs tinyweb. Skor CVSS 3.1 7.5 (High) menurut NVD.

Deskripsi (NVD)

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).

Rincian

Terbit di NVD

26 Februari 2026

Terakhir diubah

17 Juni 2026

Status NVD

Analyzed

CVSS 3.1

7.5 (High), sumber NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-400: Uncontrolled Resource Consumption
CWE-770: Allocation of Resources Without Limits or Throttling

EPSS (30 hari)

0,82% peluang dieksploitasi; lebih tinggi dari 56,2% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://github.com/maximmasiutin/TinyWeb/security/advisories/GHSA-992w-gmcm-fmgr advisory vendor
• https://github.com/maximmasiutin/TinyWeb/commit/1cb5a1d patch
• https://www.masiutin.net/tinyweb-cve-2026-27633.html advisory pihak ketiga