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Database

OS Command Injection In apache-log4j2

Description

Apache Log4j JSON Template Layout: Improper serialization of non-finite floating-point values in JsonTemplateLayout Apache Log4j's JsonTemplateLayout, 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.

Mitigation

Update Impact

Minimal update. May introduce new vulnerabilities or breaking changes.

Ecosystem
Package
Affected version
Patched versions

Aliases

1. CVE-2026-344812. NVD-2026-344813. OSV-DEBIAN-2026-344814. OSV-2026-344815. GCVE-2026-344816. SECURITY-TRACKER-CVE-2026-34481

References

1. https://github.com/apache/logging-log4j2/pull/40802. https://lists.apache.org/thread/n34zdv00gbkdbzt2rx9rf5mqz6lhopcv3. https://logging.apache.org/cyclonedx/vdr.xml4. https://logging.apache.org/log4j/2.x/manual/json-template-layout.html5. https://logging.apache.org/security.html#CVE-2026-344816. http://www.openwall.com/lists/oss-security/2026/04/10/10

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