CVE-2026-34481

Katalog CVE

CVSS 7.5 · High EPSS 0,85%

Kerentanan Improper Encoding or Escaping of Output pada apache log4j. Skor CVSS 3.1 7.5 (High) menurut NVD.

Deskripsi (NVD)

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, or logs an object directly (e.g., via Logger.info(Object), which wraps it in an ObjectMessage), where the message contains an attacker-controlled floating-point value. Users are advised to upgrade to Apache Log4j JSON Template Layout 2.25.4, which corrects this issue. Note: The fix released in version 2.25.4 did not cover all affected code paths. CVE-2026-49844 was assigned to the remaining issue, which concerns the MapMessage.asJson() serialization in Apache Log4j API and is fixed in versions 2.25.5 and 2.26.1.

Rincian

Terbit di NVD

10 April 2026

Terakhir diubah

11 Juli 2026

Status NVD

Modified

CVSS 3.1

7.5 (High), sumber NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-116: Improper Encoding or Escaping of Output

EPSS (30 hari)

0,85% peluang dieksploitasi; lebih tinggi dari 57,2% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://lists.apache.org/thread/n34zdv00gbkdbzt2rx9rf5mqz6lhopcv mailing list · advisory vendor
• https://logging.apache.org/security.html#CVE-2026-34481 advisory vendor
• http://www.openwall.com/lists/oss-security/2026/04/10/10 mailing list · advisory pihak ketiga
• https://github.com/apache/logging-log4j2/pull/4080 issue tracking
• https://logging.apache.org/cyclonedx/vdr.xml product
• https://logging.apache.org/log4j/2.x/manual/json-template-layout.html deskripsi teknis