CVE-2025-6176: 
Python vulnerability analysis and mitigation

Scrapy versions up to 2.13.2 are vulnerable to a denial of service (DoS) attack due to a flaw in its brotli decompression implementation. The vulnerability was discovered and disclosed on October 30, 2025, and is tracked as CVE-2025-6176 (NVD).

The vulnerability stems from a failure in the protection mechanism against decompression bombs specifically for the brotli variant. The issue arises because brotli can achieve extremely high compression ratios for zero-filled data, which leads to excessive memory consumption during decompression. The vulnerability has been assigned a CVSS v3.0 base score of 7.5 (HIGH) with the vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H, indicating a high-severity issue with network accessibility and no required privileges or user interaction (NVD).

When exploited, this vulnerability allows remote servers to crash clients with less than 80GB of available memory. The attack specifically targets the resource consumption aspect of the system, leading to denial of service conditions. The vulnerability is classified under CWE-400 (Uncontrolled Resource Consumption) (NVD).