CVE-2024-1892Public exploitNetwork attack vector

Crawler hang via inefficient XML regular expressions

Published Feb 28, 2024 · Updated Aug 11, 2024

Regular expression denial of service in Scrapy before 1.8.4 and 2.0 through 2.11.0 allows remote attackers to hang XML-feed crawlers. XMLFeedSpider's default iternodes path passes response bodies to scrapy.utils.iterators.xmliter, whose backtracking regular expressions parse element boundaries with inefficient worst-case complexity. The crawler must process attacker-controlled XML through the default iterator; resulting CPU and memory exhaustion can leave its service unresponsive.

CVSS severity7.5
High
EPSS probability0.56%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Regular expression denial of service in Scrapy before 1.8.4 and 2.0 through 2.11.0 allows remote attackers to hang XML-feed crawlers. XMLFeedSpider's default iternodes path passes response bodies to scrapy.utils.iterators.xmliter, whose backtracking regular expressions parse element boundaries with inefficient worst-case complexity. The crawler must process attacker-controlled XML through the default iterator; resulting CPU and memory exhaustion can leave its service unresponsive.

The record

CVE
CVE-2024-1892
Published
Feb 28, 2024
Updated
Aug 11, 2024
Vendor
Scrapy
Product
Scrapy
Classifications
CWE-1333, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 28, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 11, 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
  2. Affected versionversion=unspecified <2.11

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Scrapy · Scrapyversion=0 <2.11; version=unspecified <2.11

Published CVSS scores

7.5GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-1333Inefficient Regular Expression Complexity
T1499.004Application or System Exploitation

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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