CVE Watch9 oct 2026

CVE-2026-105244

Improper Encoding or Escaping of Output vulnerability in the RemoteSyslogAppender of Apache log4net. Every character outside visible ASCII

CVSS

5.3

Medio

EPSS

0.8%

p57

KEV

—

Exploit Today

0-100

Publicado: 6 oct 2026 · Última mod.: 9 oct 2026 · CWE-116

EPSS · 30d

0.3%EPSS · 30 días0.8%

2026-10-072026-10-22

Descripción técnica

Improper Encoding or Escaping of Output vulnerability in the RemoteSyslogAppender of Apache log4net. Every character outside visible ASCII and space was removed from the record instead of being escaped, so non-ASCII text and control characters such as tabs disappeared without notice. A party whose data reaches a log message could make a distinct value look identical in the record, for example a user name holding a zero-width space logged as admin. Only applications that use RemoteSyslogAppender are affected. This issue affects Apache log4net: from 1.2.12 before 3.5.0. Users are recommended to upgrade to version 3.5.0, which fixes the issue.

Referencias oficiales

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