{"id":"DEBIAN-CVE-2026-23901","details":"Observable Timing Discrepancy vulnerability in Apache Shiro.  This issue affects Apache Shiro: from 1.*, 2.* before 2.0.7.  Users are recommended to upgrade to version 2.0.7 or later, which fixes the issue.  Prior to Shiro 2.0.7, code paths for non-existent vs. existing users are different enough, that a brute-force attack may be able to tell, by timing the requests only, determine if the request failed because of a non-existent user vs. wrong password.  The most likely attack vector is a local attack only. Shiro security model  https://shiro.apache.org/security-model.html#username_enumeration  discusses this as well.  Typically, brute force attack can be mitigated at the infrastructure level.","modified":"2026-09-01T16:06:35.712491248Z","published":"2026-02-10T10:15:59.240Z","upstream":["CVE-2026-23901"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-23901"}],"affected":[{"package":{"name":"shiro","ecosystem":"Debian:12","purl":"pkg:deb/debian/shiro?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.2-5","1.3.2-6"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-23901.json"}},{"package":{"name":"shiro","ecosystem":"Debian:13","purl":"pkg:deb/debian/shiro?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.2-6"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-23901.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N"}]}