CVE-2026-34481
Gravedad CVSS v4.0:
MEDIA
Tipo:
No Disponible / Otro tipo
Fecha de publicación:
10/04/2026
Última modificación:
24/04/2026
Descripción
*** Pendiente de traducción *** Apache Log4j&#39;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.<br />
<br />
An attacker can exploit this issue only if both of the following conditions are met:<br />
<br />
* The application uses JsonTemplateLayout.<br />
* The application logs a MapMessage containing an attacker-controlled floating-point value.<br />
<br />
<br />
Users are advised to upgrade to Apache Log4j JSON Template Layout 2.25.4, which corrects this issue.
Impacto
Puntuación base 4.0
6.30
Gravedad 4.0
MEDIA
Puntuación base 3.x
7.50
Gravedad 3.x
ALTA
Productos y versiones vulnerables
| CPE | Desde | Hasta |
|---|---|---|
| cpe:2.3:a:apache:log4j:*:*:*:*:*:*:*:* | 2.14.0 (incluyendo) | 2.25.4 (excluyendo) |
| cpe:2.3:a:apache:log4j:3.0.0:alpha1:*:*:*:*:*:* | ||
| cpe:2.3:a:apache:log4j:3.0.0:alpha1_rc1:*:*:*:*:*:* | ||
| cpe:2.3:a:apache:log4j:3.0.0:alpha1_rc2:*:*:*:*:*:* | ||
| cpe:2.3:a:apache:log4j:3.0.0:beta1:*:*:*:*:*:* | ||
| cpe:2.3:a:apache:log4j:3.0.0:beta2:*:*:*:*:*:* | ||
| cpe:2.3:a:apache:log4j:3.0.0:beta3:*:*:*:*:*:* |
Para consultar la lista completa de nombres de CPE con productos y versiones, ver esta página
Referencias a soluciones, herramientas e información
- https://github.com/apache/logging-log4j2/pull/4080
- https://lists.apache.org/thread/n34zdv00gbkdbzt2rx9rf5mqz6lhopcv
- https://logging.apache.org/cyclonedx/vdr.xml
- https://logging.apache.org/log4j/2.x/manual/json-template-layout.html
- https://logging.apache.org/security.html#CVE-2026-34481
- http://www.openwall.com/lists/oss-security/2026/04/10/10



