{"id":"CVE-2026-104721","revision":"a20122ac8a0f42b6a0298ca5821e06a3","records":[{"revision":"a20122ac8a0f42b6a0298ca5821e06a3","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-104721","aliases":[],"title":"Logback: Incomplete protection against CVE-2026-19880","description":"Path-traversal vulnerability in QOS.CH Sarl Logback-classic on Java (logback-classic module) allows path-traversal vulnerability. More specifically, an \nMDC-based discriminator value flows unsanitized into a nested \nFileAppender path, letting an attacker who influences that MDC value \n(e.g. via an HTTP header)\n create and append log files outside the intended directory. \n\n\nThis issue affects Logback-classic: from 0.9.14 through 1.6.4.\u00A0 This vulnerability is similar to CVE-2026-19880 but involves other attack techniques.","state":0,"publishedAt":"2026-10-02T13:21:59.195+00:00","modifiedAt":"2026-10-02T13:21:59.195+00:00","affected":[{"ecosystem":"Vendor product","name":"Logback-classic","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"QOS.CH Sarl\",\n                    \"product\": \"Logback-classic\",\n                    \"platforms\": [\n                        \"Java\"\n                    ],\n                    \"modules\": [\n                        \"logback-classic\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"0.9.14\",\n                            \"lessThanOrEqual\": \"1.6.4\",\n                            \"versionType\": \"maven\"\n                        },\n                        {\n                            \"status\": \"unaffected\",\n                            \"version\": \"1.6.5\",\n                            \"versionType\": \"maven\"\n                        }\n                    ],\n                    \"defaultStatus\": \"affected\"\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/S:P/AU:N/RE:M/U:Green","score":6.3,"severity":"MEDIUM"}],"references":["https://logback.qos.ch/news.html#1.6.5"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-104721","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-104721","identifiers":["CVE-2026-104721"]},"retained":false,"historicalAffected":[]}],"coverage":[]}