Bug 2457321 (CVE-2026-34481) - CVE-2026-34481 org.apache.logging.log4j: Apache Log4j JsonTemplateLayout: Denial of Service via invalid JSON output
Summary: CVE-2026-34481 org.apache.logging.log4j: Apache Log4j JsonTemplateLayout: Den...
Keywords:
Status: NEW
Alias: CVE-2026-34481
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2457909
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-04-10 16:02 UTC by OSIDB Bzimport
Modified: 2026-04-13 16:48 UTC (History)
31 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-04-10 16:02:08 UTC 
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.
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