CVE-2026-105239

MediumCVSS 5.3/10Last modified Oct 9, 2026

Description

Improper Neutralization of Null Byte or NUL Character vulnerability in the EventLogAppender of Apache log4net.

A NUL character in logged content ended the Windows Event Log record at that point, so everything the layout rendered after it, including exception text and trailing fields, was silently not stored. A party whose data reaches a log message could hide the rest of that record. Only applications on Windows that use EventLogAppender 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.

Metrics

CVSS 3.1 5.3/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Weakness enumeration

CWE-158

Affected software

No affected versions have been published.

Timeline

Published: Oct 6, 2026
Last modified: Oct 9, 2026
NVD status: Analyzed

Related CVEs from 2026

CVE-2026-105247.5The CoCart WordPress plugin before 4.9.0 does not validate a user-supplied price value against the actual product price when items are added CVE-2026-1052405.3Improper Neutralization of Null Byte or NUL Character vulnerability in the OutputDebugStringAppender of Apache log4net. A NUL character in CVE-2026-1052415.3Improper Handling of Unicode Encoding vulnerability in the SmtpPickupDirAppender of Apache log4net. Content that the mail file writer canno CVE-2026-1052425.3Improper Handling of Exceptional Conditions vulnerability in the aspnet-request pattern converter of Apache log4net. Reading request parame CVE-2026-1052435.3Insufficient Logging vulnerability in the EventLogAppender of Apache log4net. Long messages were truncated to a fixed size that exceeds wha CVE-2026-1052445.3Improper Encoding or Escaping of Output vulnerability in the RemoteSyslogAppender of Apache log4net. Every character outside visible ASCII CVE-2026-1052453.7A vulnerability has been found in sgl-project sglang up to 0.5.21. This issue affects the function server_info of the file python/sglang/srt CVE-2026-1052467.3A vulnerability was found in SourceCodester Online Reviewer Management System 1.0. Impacted is an unknown function of the file /reviewer_0/a CVE-2026-1052477.3A vulnerability was determined in SourceCodester Online Reviewer Management System 1.0. The affected element is an unknown function of the f CVE-2026-1052486.3A security flaw has been discovered in vgmstream up to r2117. This affects the function parse_params/txtp_parse of the file src/meta/txtp_pa CVE-2026-1052494.8A weakness has been identified in vgmstream up to r2117. This impacts the function make_group_random of the file src/meta/txtp_process.c of CVE-2026-105256.1The NEX-Forms WordPress plugin before 9.2.3 does not sanitise and escape some submitted form data before storing it and outputting it back