CVE-2022-22823

build_model in xmlparse.c in Expat (aka libexpat) before 2.4.3 has an integer overflow.

CVSS 3.1

9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

3.6% chance of exploitation in the next 30 days; higher than 89% of CVEs (scores of 2026-10-25)

CWE

CWE-190

Published

2022-01-10

Modified

2026-10-14

Record from

the NVD, synced 2026-10-19

Affected

• debian:debian_linux
• libexpat_project:libexpat
• siemens:sinema_remote_connect_server
• tenable:nessus

References

• http://www.openwall.com/lists/oss-security/2022/01/17/3
• https://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdf
• https://github.com/libexpat/libexpat/pull/539
• https://security.gentoo.org/glsa/202209-24
• https://www.debian.org/security/2022/dsa-5073

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