01 Record

CVE-2022-23990

Expat (aka libexpat) before 2.4.4 has an integer overflow in the doProlog function.

HighPUBLISHEDCNA: mitre

CNA base score7.5 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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02 Description

Expat (aka libexpat) before 2.4.4 has an integer overflow in the doProlog function.

03 Exploitation and scoring

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

4.68% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 91.6% of scored records. A rank, not a probability.

NVD base score

7.5 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Modified. NVD last modified this record on 2026-10-14.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2022-01-26 18:02Z4 YR AGO

Last updated

2026-10-14 15:57Z15 DAYS AGO

Reserved

2022-01-26

Assigning CNA

mitre

Record state

PUBLISHED

Severity

High (CVSS 7.5)

CNA CVSS vector

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

Weaknesses

CWE-190Integer Overflow or WraparoundBase

Data version

5.2

Document digest

11e481195041df5b308d6072e21de888c6e73432b733052369e6a1a70b53bf3b

05 Affected products

VendorProductVersionsPlatforms

debiandebian_linuxNot specified—

fedoraprojectfedoraNot specified—

libexpat_projectlibexpatNot specified—

oraclecommunications_metasolv_solutionNot specified—

redhatenterprise_linuxNot specified—

redhatjboss_core_servicesNot specified—

redhatrhel_ausNot specified—

redhatrhel_e4sNot specified—

redhatrhel_eus_long_lifeNot specified—

redhatrhel_tusNot specified—

siemenssinema_remote_connect_serverNot specified—

tenablenessusNot specified—

06 References

github.comhttps://github.com/libexpat/libexpat/pull/551x_refsource_MISC
lists.fedoraproject.orgFEDORA-2022-d2abd0858ehttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/R7FF2UH7MPXKTADYSJUAHI2Y5UHBSHUH/vendor-advisoryx_refsource_FEDORA
lists.fedoraproject.orgFEDORA-2022-88f6a3d290https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/34NXVL2RZC2YZRV74ZQ3RNFB7WCEUP7D/vendor-advisoryx_refsource_FEDORA
www.debian.orgDSA-5073https://www.debian.org/security/2022/dsa-5073vendor-advisoryx_refsource_DEBIAN
www.oracle.comhttps://www.oracle.com/security-alerts/cpuapr2022.htmlx_refsource_MISC
www.tenable.comhttps://www.tenable.com/security/tns-2022-05x_refsource_CONFIRM
cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdfx_refsource_CONFIRM
security.gentoo.orgGLSA-202209-24https://security.gentoo.org/glsa/202209-24vendor-advisoryx_refsource_GENTOO
cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/html/ssa-484086.html
cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/html/ssa-398330.html

07 Fixed in

AlmaLinux 8

expat
Fixed in 2.5.0-1.el8_10
expat-devel
Fixed in 2.5.0-1.el8_10
mingw32-expat
Fixed in 2.4.8-1.el8
mingw64-expat
Fixed in 2.4.8-1.el8

CloudLinux 8

expat
Fixed in 2.5.0-1.el8_10
expat-devel
Fixed in 2.5.0-1.el8_10
mingw32-expat
Fixed in 2.4.8-1.el8
mingw64-expat
Fixed in 2.4.8-1.el8

Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.

Debian 12

expat
Fixed in 2.4.3-3
libxmltok
No fix yet

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

expat
Fixed in 2.4.3-3

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

expat
Fixed in 2.4.3-3

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.