CVE-2026-105242

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-105242
Improper Handling of Exceptional Conditions vulnerability in the aspnet-request pattern converter of Apache log4net. Reading request parameters triggers ASP.NET request validation, so a request carrying content such as markup made the layout throw and the appender discarded the whole event. A sender could suppress the log record of their own request. Only applications on ASP.NET for .NET Framework whose layout uses %aspnet-request are affected. This issue affects Apache log4net: from 1.2.11 before 3.5.0. Users are recommended to upgrade to version 3.5.0, which fixes the issue.

5.3 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

References
Link Resource
https://github.com/apache/logging-log4net/commit/145203420c579a703008b4b723b6a080757f4964 Patch
https://github.com/apache/logging-log4net/pull/316 Patch
https://lists.apache.org/thread.html/zg6dbqm4ztm7j3c21nfsqj0yxm5yrpdx Mailing List Vendor Advisory
http://www.openwall.com/lists/oss-security/2026/10/07/16 Mailing List Third Party Advisory
Configurations

Configuration 1 (hide)

cpe:2.3:a:apache:log4net:*:*:*:*:*:*:*:*
History

09 Oct 2026, 15:28

Type Values Removed Values Added
CPE cpe:2.3:a:apache:log4net:*:*:*:*:*:*:*:*
References () https://github.com/apache/logging-log4net/commit/145203420c579a703008b4b723b6a080757f4964 - () https://github.com/apache/logging-log4net/commit/145203420c579a703008b4b723b6a080757f4964 - Patch
References () https://github.com/apache/logging-log4net/pull/316 - () https://github.com/apache/logging-log4net/pull/316 - Patch
References () https://lists.apache.org/thread.html/zg6dbqm4ztm7j3c21nfsqj0yxm5yrpdx - () https://lists.apache.org/thread.html/zg6dbqm4ztm7j3c21nfsqj0yxm5yrpdx - Mailing List, Vendor Advisory
References () http://www.openwall.com/lists/oss-security/2026/10/07/16 - () http://www.openwall.com/lists/oss-security/2026/10/07/16 - Mailing List, Third Party Advisory
First Time Apache log4net
Apache

07 Oct 2026, 07:16

Type Values Removed Values Added
References
  • () http://www.openwall.com/lists/oss-security/2026/10/07/16 -

06 Oct 2026, 20:17

Type Values Removed Values Added
New CVE
Information

Published : 2026-10-06 20:17

Updated : 2026-10-09 15:28

NVD link : CVE-2026-105242

Mitre link : CVE-2026-105242

CVE.ORG link : CVE-2026-105242

JSON object : View

Products Affected

apache

  • log4net
CWE
CWE-755

Improper Handling of Exceptional Conditions