CWE-158Variant1 in KEV

Improper Neutralization of Null Byte or NUL Character

Incomplete in the CWE catalog · 31 CVEs mapped

31
CVEs mapped
1
In KEV
6.8
Median CVSS
What it is

The product receives input from an upstream component, but it does not neutralize or incorrectly neutralizes NUL characters or null bytes when they are sent to a downstream component.

Recent examples
—none
CVE-2026-84790

CVE-2026-84790 - UNKNOWN Severity Vulnerability

OpenVPN 2.7_alpha1 through 2.7.7 allows remote authenticated users to impersonate others via a crafted certificate subject field

no explanation yet
0%
epss
7.8cvss
CVE-2026-92705

CVE-2026-92705 - HIGH Severity Vulnerability

Aegisub is a cross-platform advanced subtitle editor. From 3.2.0 to 3.4.2, Aegisub automatically loads Automation scripts referenced by `Automation Scripts` metadata in `ASS` subtitle projects without asking whether the user trusts the scripts or their authors. An attacker can distribute a crafted `ASS` file together with a referenced malicious Automation script, and opening the `AS`  file executes arbitrary code with the privileges of the Aegisub process. From 3.4.0 to 3.4.2, inconsistent handling of embedded `NUL` characters between extension validation and filesystem operations additionally allows a crafted `ASS/Lua` polyglot to reference and execute itself as a single-file variant. The vulnerability is fixed in Aegisub 3.5.0.

HIGHno explanation yet
0%
epss
5.3cvss
CVE-2026-105240

CVE-2026-105240 - MEDIUM Severity Vulnerability

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.

MEDIUMno explanation yet
1%
epss
The record
Technical detail
CWE ID
CWE-158
Abstraction
Variant
Structure
Simple
Status
Incomplete
References (3)