CVE-2026-34481 Detail
Received
This CVE record has recently been published to the CVE List and has been included within the NVD dataset. DescriptionApache 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. Metrics
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CVSS 4.0 Severity and Vector Strings:
CNA: Apache Software Foundation
CVSS-B 6.3 MEDIUM
Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N
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Weakness Enumeration
Quick InfoCVE Dictionary Entry:CVE-2026-34481 NVD Published Date: 04/10/2026 NVD Last Modified: 04/10/2026 Source: Apache Software Foundation |
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