CVE-2024-50602Public exploitNetwork attack vector

Process crash via unstarted parser suspension

Published Oct 27, 2024 · Updated Apr 30, 2025

Denial of service in Expat Project libexpat before 2.6.4 allows remote attackers to crash a consuming process via parser API misuse. XML_StopParser accepts a stop or suspend request while the parser is initialized but unstarted, leaving XML_ResumeParser to reach normal_updatePosition and dereference a null input pointer. Exploitation requires a consuming application to expose that API-state sequence; the demonstrated consequence is termination of the affected process, not data access or modification.

CVSS severity5.9
Medium
EPSS probability1.03%
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 Expat Project libexpat before 2.6.4 allows remote attackers to crash a consuming process via parser API misuse. XML_StopParser accepts a stop or suspend request while the parser is initialized but unstarted, leaving XML_ResumeParser to reach normal_updatePosition and dereference a null input pointer. Exploitation requires a consuming application to expose that API-state sequence; the demonstrated consequence is termination of the affected process, not data access or modification.

The record

CVE
CVE-2024-50602
Published
Oct 27, 2024
Updated
Apr 30, 2025
Vendor
Expat Project
Product
libexpat
Classifications
CWE-754, CWE-476, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 27, 2024CVE publishedPublication date reported by the CVE source.
  2. Apr 30, 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 <2.6.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Expat Project · libexpatversion=0 <2.6.4

Published CVSS scores

5.9CISA ADPCVSS:3.1/AV:N/AC:H/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 exploitPublished

Weakness, pattern, technique

CWE-754Improper Check for Unusual or Exceptional Conditions
CWE-476NULL Pointer Dereference
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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