CVE-2026-34481

Published: Apr 10, 2026 Last Modified: Apr 13, 2026
ExploitDB:
Other exploit source:
Google Dorks:
MEDIUM 6,3
Source: [email protected]
Attack Vector: network
Attack Complexity: high
Privileges Required: none
User Interaction: none
Confidentiality: N/A
Integrity: N/A
Availability: N/A

Description

AI Translation Available

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.

EPSS (Exploit Prediction Scoring System)

Trend Analysis

EPSS (Exploit Prediction Scoring System)

Prevede la probabilità di sfruttamento basata su intelligence sulle minacce e sulle caratteristiche della vulnerabilità.

EPSS Score
0,0012
Percentile
0,3th
Updated

EPSS Score Trend (Last 6 Days)

116

Improper Encoding or Escaping of Output

Draft
Abstraction: Class Structure: Simple
Common Consequences
Security Scopes Affected:
Integrity Confidentiality Availability Access Control
Potential Impacts:
Modify Application Data Execute Unauthorized Code Or Commands Bypass Protection Mechanism
Applicable Platforms
Technologies: AI/ML, Database Server, Not Technology-Specific, Web Server
Likelihood of Exploit: High
View CWE Details
http://www.openwall.com/lists/oss-security/2026/04/10/10
http://www.openwall.com/lists/oss-security/2026/04/10/10
https://github.com/apache/logging-log4j2/pull/4080
https://github.com/apache/logging-log4j2/pull/4080
https://lists.apache.org/thread/n34zdv00gbkdbzt2rx9rf5mqz6l…
https://lists.apache.org/thread/n34zdv00gbkdbzt2rx9rf5mqz6lhopcv
https://logging.apache.org/cyclonedx/vdr.xml
https://logging.apache.org/cyclonedx/vdr.xml
https://logging.apache.org/log4j/2.x/manual/json-template-l…
https://logging.apache.org/log4j/2.x/manual/json-template-layout.html
https://logging.apache.org/security.html#CVE-2026-34481
https://logging.apache.org/security.html#CVE-2026-34481