๐Ÿ›ก๏ธ CVE-2026-40023
๐ŸŸก CVSS 5.3 โ€” Medium โœ… No Known Exploit CWE-116 NVD
5.3
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Apache Log4cxx's XMLLayout https://logging.apache.org/log4cxx/1.7.0/classlog4cxx_1_1xml_1_1XMLLayout.html , in versions before 1.7.0, fails to sanitize characters forbidden by the XML 1.0 specification https://www.w3.org/TR/xml/#charsets in log messages, NDC, and MDC property keys and values, producing invalid XML output. Conforming XML parsers must reject such documents with a fatal error, which may cause downstream log processing systems to drop or fail to index affected records. An attacker who can influence logged data can exploit this to suppress individual log records, impairing audit trails and detection of malicious activity. Users are advised to upgrade to Apache Log4cxx 1.7.0, which fixes this issue.

Details

Severity MEDIUM
CVSS Score 5.3
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
CWE CWE-116
Public Exploit โœ… No
Source NVD
Published 2026-04-10
Updated 2026-06-02
Modified 2026-04-21

Affected Packages

Software From version Fixed in
log4cxx โ€” 1.7.0

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