CVE Database›Document archive›CVE-2022-25235

CVE-2022-25235

expat: Malformed 2- and 3-byte UTF-8 sequences can lead to arbitrary code execution

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Severity

Important

Red Hat Product Security

9.8

CVSS 3.1

Review impact separately from score.

Published · February 19, 2022

Updated · October 9, 2026

Description

A flaw was found in expat. Passing malformed 2- and 3-byte UTF-8 sequences (for example, from start tag names) to the XML processing application on top of expat can lead to arbitrary code execution. This issue is dependent on how invalid UTF-8 is handled inside the XML processor.

Statement

This flaw affects applications that leverage expat to parse untrusted XML files. Applications that only parse trusted XML files or do not process XML files at all are not affected by this flaw.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

There is no known mitigation other than restricting applications using the expat library from processing untrusted XML content. Please update the affected packages as soon as possible.

CVSS / CWE

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

CWE-838 · Inappropriate Encoding for Output Context