PT-2025-45657 · Pypi · Brotli+1

Published 2025-10-31 · Updated 2025-10-31

OSV

CVSS v3.1

7.5

High

Base vector

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

Scrapy versions up to 2.13.3 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. Mitigation for this vulnerability needs security enhancement added in brotli v1.2.0.

Fix

Resource Exhaustion

Weakness Enumeration

CWE-400

Related Identifiers

GHSA-2QFP-Q593-8484

Affected Products

Brotli

Scrapy

References · 14

• https://osv.dev/vulnerability/GHSA-2qfp-q593-8484 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-6176 · Security Note
• https://github.com/scrapy/scrapy/commit/14737e91edc513967f516fc839cc9c8a4f8d91da · Note
• https://github.com/scrapy/scrapy/pull/7134 · Note
• https://github.com/google/brotli/issues/1327 · Note
• https://github.com/google/brotli/releases/tag/v1.2.0 · Note
• https://github.com/google/brotli/pull/1234 · Note
• https://github.com/google/brotli/issues/1327#issuecomment-3479462458 · Note
• https://github.com/google/brotli/issues/1327#issuecomment-3457434715 · Note
• https://github.com/google/brotli/issues/1375 · Note
• https://github.com/google/brotli/commit/67d78bc41db1a0d03f2e763497748f2f69946627 · Note
• https://github.com/google/brotli · Note
• https://github.com/github/advisory-database/pull/6380 · Note
• https://huntr.com/bounties/2c26a886-5984-47ee-a421-0d5fe1344eb0 · Note