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CVE-2022-40674

29
FAUCET Score

CVE-2022-40674 is a high-severity use-after-free vulnerability in the libexpat XML parser, specifically within the doContent function, affecting versions prior to 2.4.9. This flaw can be exploited remotely with high impact on confidentiality, integrity, and availability, though it requires high attack complexity. While the vulnerability has a high CVSS score of 8.1, there is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
< 2.4.9CPE matchmatch criteria
cpe:2.3:a:libexpat_project:libexpat:*:*:*:*:*:*:*:*
10.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
11.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
35CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*
36CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:36:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.1HIGH

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.2
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.76%
Probability of exploitation in next 30 days
EPSS Percentile
75.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0176 is in the 34th percentile among its peer group of 8,920 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (34)

denopatch availablevia llm_extracted
Fixed in: 4.1.14
View patch
github_advisorypatch availablevia nvd_reference
View patch
libreofficepatch availablevia llm_extracted
Fixed in: 4.1.14
View patch
microsoftpatch availablevia msrc
Product: 18619-16823Fixed in: 2.4.8-2
microsoftpatch availablevia msrc
Product: cm1 expat 2.4.9-1 on CBL Mariner 1.0Fixed in: 2.4.9-1
microsoftpatch availablevia msrc
Product: 18618-16820Fixed in: 2.4.9-1
microsoftpatch availablevia msrc
Product: cbl2 expat 2.4.8-2 on CBL Mariner 2.0Fixed in: 2.4.8-2
nessuspatch availablevia llm_extracted
Fixed in: 4.1.14
postgresqlpatch availablevia llm_extracted
Fixed in: 4.1.14
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: firefox-0:102.3.0-7.el8_6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: mingw-expat-0:2.4.8-2.el8
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: expat-0:2.2.5-8.el8_6.3
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.1 Update Services for SAP SolutionsFixed in: firefox-0:102.3.0-7.el8_1
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.1 Update Services for SAP SolutionsFixed in: thunderbird-0:102.3.0-4.el8_1
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.1 Update Services for SAP SolutionsFixed in: expat-0:2.2.5-3.el8_1.2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.2 Extended Update SupportFixed in: thunderbird-0:102.3.0-4.el8_2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.2 Extended Update SupportFixed in: firefox-0:102.3.0-7.el8_2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.2 Extended Update SupportFixed in: expat-0:2.2.5-3.el8_2.3
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.4 Extended Update SupportFixed in: thunderbird-0:102.3.0-4.el8_4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.4 Extended Update SupportFixed in: firefox-0:102.3.0-7.el8_4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.4 Extended Update SupportFixed in: expat-0:2.2.5-4.el8_4.4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: firefox-0:102.3.0-7.el9_0
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: thunderbird-0:102.3.0-4.el9_0
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: expat-0:2.2.10-12.el9_0.3
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Virtualization 4 for Red Hat Enterprise Linux 8Fixed in: redhat-virtualization-host-0:4.5.3-202211170828_8.6
View patch
redhatpatch availablevia redhat_api
Product: Text-Only JBCSFixed in: expat
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6 Extended Lifecycle SupportFixed in: expat-0:2.0.1-15.el6_10
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6 Extended Lifecycle SupportFixed in: compat-expat1-0:1.95.8-9.el6_10
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: thunderbird-0:102.3.0-4.el8_6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: thunderbird-0:102.3.0-4.el7_9
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: firefox-0:102.3.0-7.el7_9
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: expat-0:2.1.0-15.el7_9
View patch
redhatno patchvia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: thunderbird:flatpak/thunderbird
redhatno patchvia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: firefox:flatpak/firefox

Vendor Advisories (6)

redhatCVE-2022-40674Important

expat: a use-after-free in the doContent function in xmlparse.c

Sep 14, 2022
microsoft2022-Sep/CVE-2022-40674Important

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

Sep 13, 2022
denollm-deno-b1e51f965dac96d7

"Use after free" fixed in expat >= 2.4.9

postgresqlllm-postgresql-7aff2dd96d049287

"Use after free" fixed in expat >= 2.4.9

libreofficellm-libreoffice-5371de7e152bc29c

"Use after free" fixed in expat >= 2.4.9

nessusllm-nessus-e1b69d613a94fcfc

"Use after free" fixed in expat >= 2.4.9

References

github.com / libexpat/libexpat/pull/629
Issue TrackingPatchThird Party Advisory
github.com / libexpat/libexpat/pull/640
Issue TrackingPatchThird Party Advisory
lists.debian.org / debian-lts-announce/2022/09/msg00029.html
Issue TrackingThird Party Advisory
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/GSVZN3IJ6OCPSJL7AEX3ZHSHAHFOGESK
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/J2IGJNHFV53PYST7VQV3T4NHVYAMXA36
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/LQB6FJAM5YQ35SF5B2MN25Y2FX56EOEZ
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/WE2ZKEPGFCZ7R6DRVH3K6RBJPT42ZBEG
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/XCGBVQQ47URGJAZWHCISHDWF6QBTV2LE
security.gentoo.org / glsa/202209-24
Third Party Advisory
security.gentoo.org / glsa/202211-06
Third Party Advisory
security.netapp.com / advisory/ntap-20221028-0008
Third Party Advisory
debian.org / security/2022/dsa-5236
Third Party Advisory