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Vulnerability record · CVE-2025-6176 · published 31 October 2025

CVE-2025-6176: Uncontrolled resource consumption vulnerability

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 protection mechanism against decompression bombs fails to mitigate the brotli variant, allowing remote servers to crash clients with less than 80GB of available memory. This occurs because brotli can achieve extremely high compression ratios for zero-filled data, leading to excessive memory consumption during decompression.

7.5 CVSS 3.0 High EPSS 0.50% · top 59.5% CWE-400 · Uncontrolled resource consumption Deferred
7.5CVSS 3.0 base score
0.50%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
1References
17 Jun 2026Last modified by NVD

Description

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 protection mechanism against decompression bombs fails to mitigate the brotli variant, allowing remote servers to crash clients with less than 80GB of available memory. This occurs because brotli can achieve extremely high compression ratios for zero-filled data, leading to excessive memory consumption during decompression.

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

LinkTags
https://huntr.com/bounties/2c26a886-5984-47ee-a421-0d5fe1344eb0

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Source: NIST National Vulnerability Database (record CVE-2025-6176), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.