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CVE-2025-6176

Brotli decompression bomb DoS in scrapy/scrapy

Published: Oct 31, 2025Updated: Nov 4, 2025 Sources: CVE List NVD GHSA BDUCWE-400
7.5HIGH
NVD MITRE
EPSS Score
0.5%
Top 59.8%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-400

Affected Products

PyPI
package-ecosystem
brotli
OSS Libraries
Scrapy
OSS Libraries
Scrapinghub, Ltd.
commercialaka scrapy
ScrapyOn-prem
OSS Libraries / web-framework
АО «СберТех»
commercial·RUaka ao sbertech, сбертех
Platform V SberLinux OS ServerOn-premOS
Operating Systems / linux-distro
scrapy
oss-project·USaka scrapy/scrapy
scrapy/scrapyLibrary
OSS Libraries / generic-library

Exploitability

Official Patch Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Impact
View detailed technique mapping

References

https://huntr.com/bounties/2c26a886-5984-47ee-a421-0d5fe1344eb0
huntr.com
https://dbugs.ptsecurity.com/vulnerability/PT-2025-44569
dbugs.ptsecurity.com
https://huntr.com/bounties/2c26a886-5984-47ee-a421-0d5fe1344eb0
huntr.com
and 9 more references View all →

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