CVE-2026-40021Published

Apache Log4net: Silent log event loss in XmlLayout and XmlLayoutSchemaLog4J due to unescaped XML 1.0 forbidden characters

Exact source revision recorded 23 Oct 2026 15:48:27 UTC. It does not establish the source's current position. Latest evidence.

Recorded JSON

cve-program · CVE-2026-40021

Published

log4net

NuGet

Original vendor version evidence · not evaluated as a NuGet range

{
                    "collectionURL": "https://www.nuget.org/packages",
                    "cpes": [
                        "cpe:2.3:a:apache:log4net:*:*:*:*:*:*:*:*"
                    ],
                    "defaultStatus": "unaffected",
                    "packageName": "log4net",
                    "packageURL": "pkg:nuget/log4net",
                    "product": "Apache Log4net",
                    "vendor": "Apache Software Foundation",
                    "versions": [
                        {
                            "lessThan": "3.3.0",
                            "status": "affected",
                            "version": "0",
                            "versionType": "nuget"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON