CVE-2026-40023 Detail
Received
This CVE record has recently been published to the CVE List and has been included within the NVD dataset. DescriptionApache 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. Metrics
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CVSS 4.0 Severity and Vector Strings:
CNA: Apache Software Foundation
CVSS-B 6.3 MEDIUM
Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N
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Weakness Enumeration
Quick InfoCVE Dictionary Entry:CVE-2026-40023 NVD Published Date: 04/10/2026 NVD Last Modified: 04/10/2026 Source: Apache Software Foundation |
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