---
id: CVE-2022-40674
title: >-
  libexpat before 2.4.9 has a use-after-free in the doContent function in
  xmlparse.c.
summary: >-
  libexpat before 2.4.9 has a use-after-free in the doContent function in
  xmlparse.c.
severity: high
cvss: 8.1
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-416
  - CWE-416
vendor: libexpat_project
product: libexpat
affected:
  - libexpat < 2.4.9
  - debian_linux = 10.0
  - debian_linux = 11.0
  - fedora = 35
  - fedora = 36
  - fedora = 37
patched:
  - libexpat 2.4.9
published: '2022-09-14'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T18:17:05.450'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2022-40674'
references:
  - url: 'https://github.com/libexpat/libexpat/pull/629'
    label: cve@mitre.org
  - url: 'https://github.com/libexpat/libexpat/pull/640'
    label: cve@mitre.org
  - url: 'https://lists.debian.org/debian-lts-announce/2022/09/msg00029.html'
    label: cve@mitre.org
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GSVZN3IJ6OCPSJL7AEX3ZHSHAHFOGESK/
    label: cve@mitre.org
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/J2IGJNHFV53PYST7VQV3T4NHVYAMXA36/
    label: cve@mitre.org
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LQB6FJAM5YQ35SF5B2MN25Y2FX56EOEZ/
    label: cve@mitre.org
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WE2ZKEPGFCZ7R6DRVH3K6RBJPT42ZBEG/
    label: cve@mitre.org
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XCGBVQQ47URGJAZWHCISHDWF6QBTV2LE/
    label: cve@mitre.org
  - url: 'https://security.gentoo.org/glsa/202209-24'
    label: cve@mitre.org
  - url: 'https://security.gentoo.org/glsa/202211-06'
    label: cve@mitre.org
  - url: 'https://security.netapp.com/advisory/ntap-20221028-0008/'
    label: cve@mitre.org
  - url: 'https://www.debian.org/security/2022/dsa-5236'
    label: cve@mitre.org
  - url: 'https://github.com/libexpat/libexpat/pull/629'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://github.com/libexpat/libexpat/pull/640'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2022/09/msg00029.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GSVZN3IJ6OCPSJL7AEX3ZHSHAHFOGESK/
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/J2IGJNHFV53PYST7VQV3T4NHVYAMXA36/
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LQB6FJAM5YQ35SF5B2MN25Y2FX56EOEZ/
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WE2ZKEPGFCZ7R6DRVH3K6RBJPT42ZBEG/
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XCGBVQQ47URGJAZWHCISHDWF6QBTV2LE/
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://security.gentoo.org/glsa/202209-24'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://security.gentoo.org/glsa/202211-06'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://security.netapp.com/advisory/ntap-20221028-0008/'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://www.debian.org/security/2022/dsa-5236'
    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-558014.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-892048.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
epss: 0.02223
epssPercentile: 0.82346
ingestedAt: '2026-10-14T18:47:39.272Z'
---

## Overview

libexpat before 2.4.9 has a use-after-free in the doContent function in xmlparse.c.

## Affected

- `libexpat < 2.4.9`
- `debian_linux = 10.0`
- `debian_linux = 11.0`
- `fedora = 35`
- `fedora = 36`
- `fedora = 37`

## Remediation

Upgrade past the affected range:

- `libexpat 2.4.9`