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Vulnerability Details CVE-2026-34479

The Log4j1XmlLayout from the Apache Log4j 1-to-Log4j 2 bridge fails to escape characters forbidden by the XML 1.0 standard, producing malformed XML output. Conforming XML parsers are required to reject documents containing such characters with a fatal error, which may cause downstream log processing systems to drop or fail to index affected records. Two groups of users are affected: * Those using Log4j1XmlLayout directly in a Log4j Core 2 configuration file. * Those using the Log4j 1 configuration compatibility layer with org.apache.log4j.xml.XMLLayout specified as the layout class. Users are advised to upgrade to Apache Log4j 1-to-Log4j 2 bridge version 2.25.4, which corrects this issue. Note: The Apache Log4j 1-to-Log4j 2 bridge is deprecated and will not be present in Log4j 3. Users are encouraged to consult the Log4j 1 to Log4j 2 migration guide https://logging.apache.org/log4j/2.x/migrate-from-log4j1.html , and specifically the section on eliminating reliance on the bridge.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.005
EPSS Ranking 40.8%
CVSS Severity
CVSS v3 Score 7.5
Products affected by CVE-2026-34479
  • Apache » Log4j » Version: 2.10.0
    cpe:2.3:a:apache:log4j:2.10.0
  • Apache » Log4j » Version: 2.11.0
    cpe:2.3:a:apache:log4j:2.11.0
  • Apache » Log4j » Version: 2.11.1
    cpe:2.3:a:apache:log4j:2.11.1
  • Apache » Log4j » Version: 2.11.2
    cpe:2.3:a:apache:log4j:2.11.2
  • Apache » Log4j » Version: 2.12.0
    cpe:2.3:a:apache:log4j:2.12.0
  • Apache » Log4j » Version: 2.12.1
    cpe:2.3:a:apache:log4j:2.12.1
  • Apache » Log4j » Version: 2.12.2
    cpe:2.3:a:apache:log4j:2.12.2
  • Apache » Log4j » Version: 2.12.3
    cpe:2.3:a:apache:log4j:2.12.3
  • Apache » Log4j » Version: 2.12.4
    cpe:2.3:a:apache:log4j:2.12.4
  • Apache » Log4j » Version: 2.13.0
    cpe:2.3:a:apache:log4j:2.13.0
  • Apache » Log4j » Version: 2.13.1
    cpe:2.3:a:apache:log4j:2.13.1
  • Apache » Log4j » Version: 2.13.2
    cpe:2.3:a:apache:log4j:2.13.2
  • Apache » Log4j » Version: 2.13.3
    cpe:2.3:a:apache:log4j:2.13.3
  • Apache » Log4j » Version: 2.14.0
    cpe:2.3:a:apache:log4j:2.14.0
  • Apache » Log4j » Version: 2.14.1
    cpe:2.3:a:apache:log4j:2.14.1
  • Apache » Log4j » Version: 2.15.0
    cpe:2.3:a:apache:log4j:2.15.0
  • Apache » Log4j » Version: 2.15.1
    cpe:2.3:a:apache:log4j:2.15.1
  • Apache » Log4j » Version: 2.16.0
    cpe:2.3:a:apache:log4j:2.16.0
  • Apache » Log4j » Version: 2.17.0
    cpe:2.3:a:apache:log4j:2.17.0
  • Apache » Log4j » Version: 2.17.1
    cpe:2.3:a:apache:log4j:2.17.1
  • Apache » Log4j » Version: 2.18.0
    cpe:2.3:a:apache:log4j:2.18.0
  • Apache » Log4j » Version: 2.19.0
    cpe:2.3:a:apache:log4j:2.19.0
  • Apache » Log4j » Version: 2.20.0
    cpe:2.3:a:apache:log4j:2.20.0
  • Apache » Log4j » Version: 2.21.0
    cpe:2.3:a:apache:log4j:2.21.0
  • Apache » Log4j » Version: 2.21.1
    cpe:2.3:a:apache:log4j:2.21.1
  • Apache » Log4j » Version: 2.22.0
    cpe:2.3:a:apache:log4j:2.22.0
  • Apache » Log4j » Version: 2.22.1
    cpe:2.3:a:apache:log4j:2.22.1
  • Apache » Log4j » Version: 2.23.0
    cpe:2.3:a:apache:log4j:2.23.0
  • Apache » Log4j » Version: 2.23.1
    cpe:2.3:a:apache:log4j:2.23.1
  • Apache » Log4j » Version: 2.24.0
    cpe:2.3:a:apache:log4j:2.24.0
  • Apache » Log4j » Version: 2.24.1
    cpe:2.3:a:apache:log4j:2.24.1
  • Apache » Log4j » Version: 2.24.2
    cpe:2.3:a:apache:log4j:2.24.2
  • Apache » Log4j » Version: 2.24.3
    cpe:2.3:a:apache:log4j:2.24.3
  • Apache » Log4j » Version: 2.25.0
    cpe:2.3:a:apache:log4j:2.25.0
  • Apache » Log4j » Version: 2.25.1
    cpe:2.3:a:apache:log4j:2.25.1
  • Apache » Log4j » Version: 2.25.2
    cpe:2.3:a:apache:log4j:2.25.2
  • Apache » Log4j » Version: 2.25.3
    cpe:2.3:a:apache:log4j:2.25.3
  • Apache » Log4j » Version: 2.7
    cpe:2.3:a:apache:log4j:2.7
  • Apache » Log4j » Version: 2.8
    cpe:2.3:a:apache:log4j:2.8
  • Apache » Log4j » Version: 2.8.1
    cpe:2.3:a:apache:log4j:2.8.1
  • Apache » Log4j » Version: 2.8.2
    cpe:2.3:a:apache:log4j:2.8.2
  • Apache » Log4j » Version: 2.9.0
    cpe:2.3:a:apache:log4j:2.9.0
  • Apache » Log4j » Version: 2.9.1
    cpe:2.3:a:apache:log4j:2.9.1
  • Apache » Log4j » Version: 3.0.0
    cpe:2.3:a:apache:log4j:3.0.0


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