---
id: CVE-2024-28757
title: >-
  libexpat through 2.6.1 allows an XML Entity Expansion attack when there is
  isolated use of external parsers (created via XML_ExternalEntityParserCreate).
summary: >-
  libexpat through 2.6.1 allows an XML Entity Expansion attack when there is
  isolated use of external parsers (created via XML_ExternalEntityParserCreate).
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-776
vendor: libexpat_project
product: libexpat
affected:
  - libexpat < 2.6.2
  - fedora = 38
  - fedora = 39
  - fedora = 40
  - active_iq_unified_manager
  - oncommand_workflow_automation
  - ontap = 9
  - ontap_tools = 10
  - windows_host_utilities
  - h300s_firmware
  - h500s_firmware
  - h700s_firmware
  - h410s_firmware
  - h410c_firmware
  - h610c_firmware
  - h610s_firmware
patched:
  - libexpat 2.6.2
published: '2024-03-10'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T01:17:42.003'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2024-28757'
references:
  - url: 'http://www.openwall.com/lists/oss-security/2024/03/15/1'
    label: cve@mitre.org
  - url: 'https://github.com/libexpat/libexpat/issues/839'
    label: cve@mitre.org
  - url: 'https://github.com/libexpat/libexpat/pull/842'
    label: cve@mitre.org
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FPLC6WDSRDUYS7F7JWAOVOHFNOUQ43DD/
    label: cve@mitre.org
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LKJ7V5F6LJCEQJXDBWGT27J7NAP3E3N7/
    label: cve@mitre.org
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VK2O34GH43NTHBZBN7G5Y6YKJKPUCTBE/
    label: cve@mitre.org
  - url: 'https://security.netapp.com/advisory/ntap-20240322-0001/'
    label: cve@mitre.org
  - url: 'http://www.openwall.com/lists/oss-security/2024/03/15/1'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://github.com/libexpat/libexpat/issues/839'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://github.com/libexpat/libexpat/pull/842'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FPLC6WDSRDUYS7F7JWAOVOHFNOUQ43DD/
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LKJ7V5F6LJCEQJXDBWGT27J7NAP3E3N7/
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VK2O34GH43NTHBZBN7G5Y6YKJKPUCTBE/
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FPLC6WDSRDUYS7F7JWAOVOHFNOUQ43DD/
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LKJ7V5F6LJCEQJXDBWGT27J7NAP3E3N7/
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VK2O34GH43NTHBZBN7G5Y6YKJKPUCTBE/
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://security.netapp.com/advisory/ntap-20240322-0001/'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-398330.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-784301.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
  - exploit-available
  - cve.org
epss: 0.02006
epssPercentile: 0.80423
exploits:
  github: 2
  githubRepos:
    - 'https://github.com/RenukaSelvar/expat_CVE-2024-28757'
    - 'https://github.com/saurabh2088/expat_2_1_0_CVE-2024-28757'
  checkedAt: '2026-10-15T03:30:48.733Z'
exploitAvailable: true
ingestedAt: '2026-10-15T03:30:12.641Z'
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2024-03-11T13:15:18.395170Z'
---

## Overview

libexpat through 2.6.1 allows an XML Entity Expansion attack when there is isolated use of external parsers (created via XML_ExternalEntityParserCreate).

## Affected

- `libexpat < 2.6.2`
- `fedora = 38`
- `fedora = 39`
- `fedora = 40`
- `active_iq_unified_manager`
- `oncommand_workflow_automation`
- `ontap = 9`
- `ontap_tools = 10`
- `windows_host_utilities`
- `h300s_firmware`
- `h500s_firmware`
- `h700s_firmware`
- `h410s_firmware`
- `h410c_firmware`
- `h610c_firmware`
- `h610s_firmware`

## Remediation

Upgrade past the affected range:

- `libexpat 2.6.2`