CVE-2024-41123Network attack vector

Service hang via crafted XML character runs

Published Aug 1, 2024 · Updated Nov 3, 2025

Uncontrolled resource consumption in REXML before 3.3.3 allows attackers to hang XML-processing services with crafted XML. The XML parser spends excessive time processing documents containing long runs of whitespace and the delimiter sequences >] or ]>; upstream material does not identify the exact parser routine. Reachability requires an application to pass attacker-controlled XML to REXML, and the resulting impact is limited to availability.

CVSS severity5.3
Medium
EPSS probability1.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled resource consumption in REXML before 3.3.3 allows attackers to hang XML-processing services with crafted XML. The XML parser spends excessive time processing documents containing long runs of whitespace and the delimiter sequences >] or ]>; upstream material does not identify the exact parser routine. Reachability requires an application to pass attacker-controlled XML to REXML, and the resulting impact is limited to availability.

The record

CVE
CVE-2024-41123
Published
Aug 1, 2024
Updated
Nov 3, 2025
Vendor
libwww-perl
Product
REXML
Classifications
CWE-400, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 1, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 3, 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=0 <3.3.3
  2. Affected versionversion=< 3.3.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

libwww-perl · REXMLversion=0 <3.3.3; version=< 3.3.3

Published CVSS scores

5.3GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
7.5NISTCVSS:3.1/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.

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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-400Uncontrolled Resource Consumption
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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