CVE Watch9 oct 2026

CVE-2026-105240

Improper Neutralization of Null Byte or NUL Character vulnerability in the OutputDebugStringAppender of Apache log4net. A NUL character in

CVSS

5.3

Medio

EPSS

0.8%

p56

KEV

—

Exploit Today

0-100

Publicado: 6 oct 2026 · Última mod.: 9 oct 2026 · CWE-158

EPSS · 30d

0.3%EPSS · 30 días0.8%

2026-10-072026-10-12

Descripción técnica

Improper Neutralization of Null Byte or NUL Character vulnerability in the OutputDebugStringAppender of Apache log4net. A NUL character in logged content ended the debug output record at that point, so everything the layout rendered after it, including exception text and trailing fields, was silently lost. A party whose data reaches a log message could hide the rest of that record. Only applications on Windows that use OutputDebugStringAppender are affected. This issue affects Apache log4net: from 1.2.9 before 3.5.0. Users are recommended to upgrade to version 3.5.0, which fixes the issue.

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