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Apache Log4j Core: Silent log event loss in XmlLayout due to unescaped XML 1.0 forbidden characters

🗓️ 10 Apr 2026 18:31:17Reported by GitHub Advisory DatabaseType 
github
 github🔗 github.com👁 2 Views

Log4j Core XmlLayout up to 2.25.3 fails to sanitize XML forbidden characters; upgrade to 2.25.4.

Related
Detection
Refs
ReporterTitlePublishedViews
Family
IBM Security Bulletins		Security Bulletin: There is a vulnerability in log4j-core-2.25.3.jar used by IBM Maximo Manage application in IBM Maximo Application Suite (CVE-2026-34477, CVE-2026-34478, CVE-2026-34480)
29 May 202609:54
–ibm
IBM Security Bulletins		Security Bulletin: Multiple Vulnerabilities in Apache Log4j Core shipped in Tivoli Netcool/OMNIbus
29 May 202612:15
–ibm
IBM Security Bulletins		Security Bulletin: There is a vulnerability in log4j-core-2.25.3.jar used by IBM Maximo Manage application in IBM Maximo Application Suite (CVE-2026-34477, CVE-2026-34478, CVE-2026-34480)
29 May 202609:56
–ibm
IBM Security Bulletins		Security Bulletin: Due to use of log4j-core-2.25.3.jar, IBM Sterling Connect:Direct Web Services is vulnerable to log injection via CRLF sequences.
3 Jun 202604:27
–ibm
IBM Security Bulletins		Security Bulletin: There is a vulnerability in log4j-core-2.25.3.jar used by IBM Maximo Manage application in IBM Maximo Application Suite (CVE-2026-34480 ,CVE-2026-34477, CVE-2026-34478, CVE-2026-34479)
29 May 202608:56
–ibm
IBM Security Bulletins		Security Bulletin: Multiple Vulnerabilities in watsonx.data
9 May 202608:59
–ibm
IBM Security Bulletins		Security Bulletin: IBM SPSS Modeler is affected by multiple vulnerabilities in Apache Log4j
27 May 202617:36
–ibm
IBM Security Bulletins		Security Bulletin: IBM App Connect for Manufacturing is vulnerable to multiple vulnerabilities due to Apache Log4j and Bouncy Castle.
11 May 202606:59
–ibm
IBM Security Bulletins		Security Bulletin: IBM App Connect Enterprise and IBM Integration Bus for z/OS are vulnerable to multiple vulnerabilities due to Apache Log4j ( CVE-2026-34477, CVE-2026-34478, CVE-2026-34479 & CVE-2026-34480 )
22 May 202614:52
–ibm
Tenable Nessus		Apache Log4j 2.0-alpha1 < 2.25.4 XmlLayout Invalid XML Output (CVE-2026-34480)
15 Apr 202600:00
–nessus
Rows per page
Vulners
Node
org.apache.logging.log4jlog4j-coreRange3.0.0-alpha1–3.0.0-beta3maven
OR
org.apache.logging.log4jlog4j-coreRange2.0-alpha1–2.25.4maven

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13 Apr 2026 23:57Current
5.7Medium risk
Vulners AI Score5.7
CVSS 3.17.5
CVSS 46.9
EPSS0.00034
SSVC
CWE-116
Log4j CoreXmlLayoutXML forbidden charactersStAX implementationJRE built inWoodstoxUpgrade to 2.25.4XML output
2