{"id":"DEBIAN-CVE-2026-104721","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 1.6.4.  This vulnerability is similar to CVE-2026-19880 but involves other attack techniques.","modified":"2026-10-03T13:00:06.509150392Z","published":"2026-10-02T14:17:10.167Z","upstream":["CVE-2026-104721"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-104721"}],"affected":[{"package":{"name":"logback","ecosystem":"Debian:12","purl":"pkg:deb/debian/logback?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.2.11-3","1:1.2.11-4","1:1.2.11-5","1:1.2.11-6","1:1.6.3-1","1:1.6.3-2"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-104721.json"}},{"package":{"name":"logback","ecosystem":"Debian:13","purl":"pkg:deb/debian/logback?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.2.11-6","1:1.6.3-1","1:1.6.3-2"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-104721.json"}},{"package":{"name":"logback","ecosystem":"Debian:14","purl":"pkg:deb/debian/logback?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.2.11-6","1:1.6.3-1","1:1.6.3-2"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-104721.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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:P/AU:N/R:X/V:X/RE:M/U:Green"}]}