CVE-2022-25235

xmltok_impl.c in Expat (aka libexpat) before 2.4.5 lacks certain validation of encoding, such as checks for whether a UTF-8 character is valid in a certain context.

CVSS 3.1

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

EPSS

5.0% chance of exploitation in the next 30 days; higher than 92% of CVEs (scores of 2026-10-25)

CWE

CWE-116

Published

2022-02-16

Modified

2026-10-14

Record from

the NVD, synced 2026-10-19

Affected

• debian:debian_linux
• fedoraproject:fedora
• libexpat_project:libexpat
• oracle:http_server
• oracle:zfs_storage_appliance_kit
• siemens:sinema_remote_connect_server

References

• http://www.openwall.com/lists/oss-security/2022/02/19/1
• https://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdf
• https://github.com/libexpat/libexpat/pull/562
• https://lists.debian.org/debian-lts-announce/2022/03/msg00007.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3UFRBA3UQVIQKXTBUQXDWQOVWNBKLERU/

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