CVE-2026-40023

Katalog CVE

CVSS 5.3 · Medium EPSS 0,98%

Kerentanan Improper Encoding or Escaping of Output pada apache log4cxx. Skor CVSS 3.1 5.3 (Medium) menurut NVD.

Deskripsi (NVD)

Apache Log4cxx's XMLLayout https://logging.apache.org/log4cxx/1.7.0/classlog4cxx_1_1xml_1_1XMLLayout.html , in versions before 1.7.0, fails to sanitize characters forbidden by the XML 1.0 specification https://www.w3.org/TR/xml/#charsets in log messages, NDC, and MDC property keys and values, producing invalid XML output. Conforming XML parsers must reject such documents with a fatal error, which may cause downstream log processing systems to drop or fail to index affected records. An attacker who can influence logged data can exploit this to suppress individual log records, impairing audit trails and detection of malicious activity. Users are advised to upgrade to Apache Log4cxx 1.7.0, which fixes this issue.

Rincian

Terbit di NVD

10 April 2026

Terakhir diubah

17 Juni 2026

Status NVD

Analyzed

CVSS 3.1

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

Jenis kelemahan (CWE)

CWE-116: Improper Encoding or Escaping of Output

EPSS (30 hari)

0,98% peluang dieksploitasi; lebih tinggi dari 61,2% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://lists.apache.org/thread/y15cv3zblg3dfwr5vy6ddbnl4zyrzr8b mailing list · advisory vendor
• https://logging.apache.org/security.html#CVE-2026-40023 advisory vendor
• https://github.com/apache/logging-log4cxx/pull/609 issue tracking · patch
• http://www.openwall.com/lists/oss-security/2026/04/10/12 mailing list · advisory pihak ketiga
• https://logging.apache.org/cyclonedx/vdr.xml product
• https://logging.apache.org/log4cxx/1.7.0/classlog4cxx_1_1xml_1_1XMLLayout.html product