CVE-2024-3572Public exploitNetwork attack vector

Crawler termination via unbounded response decompression

Published Apr 16, 2024 · Updated Aug 1, 2024

Denial of service in Scrapy before 1.8.4 and 2.0 through 2.11.0 allows remote attackers to exhaust process memory. HttpCompressionMiddleware enforces DOWNLOAD_MAXSIZE only on the compressed response body, then expands attacker-controlled data without applying the limit to decompressed output. Exploitation requires a spider to crawl an attacker-controlled site; memory exhaustion can terminate the crawler and cached output can also consume disk space.

CVSS severity7.5
High
EPSS probability0.81%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Scrapy before 1.8.4 and 2.0 through 2.11.0 allows remote attackers to exhaust process memory. HttpCompressionMiddleware enforces DOWNLOAD_MAXSIZE only on the compressed response body, then expands attacker-controlled data without applying the limit to decompressed output. Exploitation requires a spider to crawl an attacker-controlled site; memory exhaustion can terminate the crawler and cached output can also consume disk space.

The record

CVE
CVE-2024-3572
Published
Apr 16, 2024
Updated
Aug 1, 2024
Vendor
Scrapy
Product
Scrapy
Classifications
CWE-409, T1499.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 16, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 1, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <2.11.1
  2. Affected versionversion=unspecified <2.11.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Scrapy · Scrapyversion=0 <2.11.1; version=unspecified <2.11.1

Published CVSS scores

7.5Scrapy GitHub Security AdvisoryCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5huntr.devCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-409Improper Handling of Highly Compressed Data (Data Amplification)
T1499.003Application Exhaustion Flood

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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