CVE-2025-67726

Katalog CVE

CVSS 7.5 · High EPSS 0,53%

Kerentanan Uncontrolled Resource Consumption pada tornadoweb tornado. Skor CVSS 3.1 7.5 (High) menurut github.com.

Deskripsi (NVD)

Tornado is a Python web framework and asynchronous networking library. Versions 6.5.2 and below use an inefficient algorithm when parsing parameters for HTTP header values, potentially causing a DoS. The _parseparam function in httputil.py is used to parse specific HTTP header values, such as those in multipart/form-data and repeatedly calls string.count() within a nested loop while processing quoted semicolons. If an attacker sends a request with a large number of maliciously crafted parameters in a Content-Disposition header, the server's CPU usage increases quadratically (O(n²)) during parsing. Due to Tornado's single event loop architecture, a single malicious request can cause the entire server to become unresponsive for an extended period. This issue is fixed in version 6.5.3.

Rincian

Terbit di NVD

12 Desember 2025

Terakhir diubah

7 Oktober 2026

Status NVD

Analyzed

CVSS 3.1

7.5 (High), sumber github.com
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-834: Excessive Iteration

EPSS (30 hari)

0,53% peluang dieksploitasi; lebih tinggi dari 43,6% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://github.com/tornadoweb/tornado/security/advisories/GHSA-jhmp-mqwm-3gq8 advisory vendor
• https://github.com/tornadoweb/tornado/commit/771472cfdaeebc0d89a9cc46e249f8891a6b29cd patch
• https://github.com/tornadoweb/tornado/releases/tag/v6.5.3 release notes