{"id":"UBUNTU-CVE-2026-19880","details":"Path-traversal vulnerability in QOS.CH Sarl Logback-classic on Java (logback-classic module) allows path-traversal vulnerability. More specifically, an MDC-based discriminator value flows unsanitized into a nested FileAppender path, letting an attacker who influences that MDC value (e.g. via an HTTP header)  create and append log files outside the intended directory. This issue affects Logback-classic: from 0.9.14 through 1.6.2.","modified":"2026-09-16T14:01:42.261876478Z","published":"2026-08-14T15:17:00Z","upstream":["CVE-2026-19880"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-19880"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-19880"},{"type":"REPORT","url":"https://logback.qos.ch/news.html#1.6.3"}],"affected":[{"package":{"name":"logback","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/logback?arch=source&distro=esm-apps%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.1.3-2","1:1.1.3-2ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"liblogback-java","binary_version":"1:1.1.3-2ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-19880.json"}},{"package":{"name":"logback","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/logback?arch=source&distro=esm-apps%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.1.9-4","1:1.1.9-5","1:1.2.3-2","1:1.2.3-2ubuntu1~18.04.1","1:1.2.3-2ubuntu1~18.04.1+esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"1:1.2.3-2ubuntu1~18.04.1+esm1","binary_name":"liblogback-java"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-19880.json"}},{"package":{"name":"logback","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/logback?arch=source&distro=esm-apps%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.2.3-5","1:1.2.3-5ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"liblogback-java","binary_version":"1:1.2.3-5ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-19880.json"}},{"package":{"name":"logback","ecosystem":"Ubuntu:Pro:22.04:LTS","purl":"pkg:deb/ubuntu/logback?arch=source&distro=esm-apps%2Fjammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.2.3-6","1:1.2.7-1","1:1.2.8-1","1:1.2.9-1","1:1.2.10-1","1:1.2.10-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"liblogback-java","binary_version":"1:1.2.10-1ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-19880.json"}},{"package":{"name":"logback","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/logback?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.2.11-3","1:1.2.11-4","1:1.2.11-5"],"ecosystem_specific":{"binaries":[{"binary_name":"liblogback-java","binary_version":"1:1.2.11-5"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-19880.json"}},{"package":{"name":"logback","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/logback?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.2.11-6","1:1.2.11-6build1"],"ecosystem_specific":{"binaries":[{"binary_name":"liblogback-java","binary_version":"1:1.2.11-6build1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-19880.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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"},{"type":"Ubuntu","score":"medium"}]}