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Vulnerability Details CVE-2026-34481

Apache Log4j's JsonTemplateLayout https://logging.apache.org/log4j/2.x/manual/json-template-layout.html , in versions up to and including 2.25.3, produces invalid JSON output when log events contain non-finite floating-point values (NaN, Infinity, or -Infinity), which are prohibited by RFC 8259. This may cause downstream log processing systems to reject or fail to index affected records. An attacker can exploit this issue only if both of the following conditions are met: * The application uses JsonTemplateLayout. * The application logs a MapMessage containing an attacker-controlled floating-point value. Users are advised to upgrade to Apache Log4j JSON Template Layout 2.25.4, which corrects this issue.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 36.2%
CVSS Severity
CVSS v3 Score 7.5
Products affected by CVE-2026-34481
  • 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: 3.0.0
    cpe:2.3:a:apache:log4j:3.0.0


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