CVE-2024-41991Network attack vector

Service interruption via Unicode URL recognition ReDoS

Published Aug 7, 2024 · Updated Nov 4, 2025

ReDoS in Django 4.2 before 4.2.15 and 5.0 before 5.0.8 allows remote attackers to hang web workers via crafted Unicode URLs. The urlize and urlizetrunc filters apply URL and email regular expressions without adequate length bounds, while AdminURLFieldWidget quotes a supplied URL before rejecting it as invalid. An application must render attacker-controlled text through either filter or process a supplied admin URL field; repeated requests can consume CPU and interrupt service.

CVSS severity7.5
High
EPSS probability0.95%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

ReDoS in Django 4.2 before 4.2.15 and 5.0 before 5.0.8 allows remote attackers to hang web workers via crafted Unicode URLs. The urlize and urlizetrunc filters apply URL and email regular expressions without adequate length bounds, while AdminURLFieldWidget quotes a supplied URL before rejecting it as invalid. An application must render attacker-controlled text through either filter or process a supplied admin URL field; repeated requests can consume CPU and interrupt service.

The record

CVE
CVE-2024-41991
Published
Aug 7, 2024
Updated
Nov 4, 2025
Vendor
Django Software Foundation
Product
Django
Classifications
CWE-1284, CWE-1333, CWE-130, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 7, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 4, 2025Record 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=4.2 <4.2.15
  2. Affected versionversion=5.0 <5.0.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Django Software Foundation · Djangoversion=4.2 <4.2.15; version=5.0 <5.0.8

Published CVSS scores

6.9GitHub Advisory DatabaseCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.3OSVCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-1284Improper Validation of Specified Quantity in Input
CWE-1333Inefficient Regular Expression Complexity
CWE-130Improper Handling of Length Parameter Inconsistency
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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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