🛡️ CVE-2026-34481
🟠 CVSS 7.5 — High ✅ No Known Exploit CWE-116 NVD
7.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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.

Details

Severity HIGH
CVSS Score 7.5
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CWE CWE-116
Public Exploit ✅ No
Source NVD
Published 2026-04-10
Updated 2026-06-15
Modified 2026-04-24
Fix URL N/A

Affected Packages

Software From version Fixed in
log4j
org.apache.logging.log4j:log4j-layout-template-json 3.0.0-alpha1

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