{"id":"DEBIAN-CVE-2025-3891","details":"A flaw was found in the mod_auth_openidc module for Apache httpd. This flaw allows a remote, unauthenticated attacker to trigger a denial of service by sending an empty POST request when the OIDCPreservePost directive is enabled. The server crashes consistently, affecting availability.","modified":"2026-09-01T16:06:15.374846201Z","published":"2025-04-29T12:15:32.137Z","upstream":["CVE-2025-3891"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2025-3891"}],"affected":[{"package":{"name":"libapache2-mod-auth-openidc","ecosystem":"Debian:12","purl":"pkg:deb/debian/libapache2-mod-auth-openidc?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.12.3-2+deb12u4"}]}],"versions":["2.4.12.3-2","2.4.12.3-2+deb12u1","2.4.12.3-2+deb12u2","2.4.12.3-2+deb12u3"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2025-3891.json"}},{"package":{"name":"libapache2-mod-auth-openidc","ecosystem":"Debian:13","purl":"pkg:deb/debian/libapache2-mod-auth-openidc?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.14.2-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2025-3891.json"}},{"package":{"name":"libapache2-mod-auth-openidc","ecosystem":"Debian:14","purl":"pkg:deb/debian/libapache2-mod-auth-openidc?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.14.2-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2025-3891.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}