{"id":"DEBIAN-CVE-2026-78030","details":"DBI versions before 1.653 for Perl load arbitrary modules via unvalidated dbm_type and dbm_mldbm attributes in DBD::DBM.  DBD::DBM passes the dbm_type and dbm_mldbm connect attributes to require without checking that the value names a module. require treats a path-shaped string as a literal filename and does not consult @INC, so the attribute chooses the file that Perl loads and runs.  The MLDBM::Serializer:: prefix that DBD::DBM prepends to dbm_mldbm is not a boundary: only the :: separators are rewritten to /, so a value containing / traverses out of the serializer directory. The value is also assigned to $MLDBM::Serializer, which MLDBM requires the same way when it ties the table.  A caller that lets an untrusted party influence either attribute, for example through a DSN fragment or a parameter that selects a storage backend, runs the file-scope code of whatever module the value names.  For example,      my $dsn = \"dbi:DBM:f_dir=/var/db;dbm_type=../../Untrusted.pm\"     my $dbh = DBI-\u003econnect( $dsn );  Note that DBD::Gofer forwards connect attributes to the server side, and DBI::ProxyServer checks only that a DSN starts with a driver prefix.","modified":"2026-09-23T08:47:36.484877543Z","published":"2026-09-19T11:16:37.667Z","upstream":["CVE-2026-78030"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-78030"}],"affected":[{"package":{"name":"libdbi-perl","ecosystem":"Debian:12","purl":"pkg:deb/debian/libdbi-perl?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.643-4","1.643-4+deb12u1","1.643-4+deb12u2","1.644-1","1.645-1","1.647-1","1.648-1","1.649-1","1.650-1","1.651-1","1.652-1","1.652-2","1.652-2~deb13u1","1.653-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-78030.json"}},{"package":{"name":"libdbi-perl","ecosystem":"Debian:13","purl":"pkg:deb/debian/libdbi-perl?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.647-1","1.647-1+deb13u1","1.648-1","1.649-1","1.650-1","1.651-1","1.652-1","1.652-2","1.652-2~deb13u1","1.653-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-78030.json"}},{"package":{"name":"libdbi-perl","ecosystem":"Debian:14","purl":"pkg:deb/debian/libdbi-perl?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.653-1"}]}],"versions":["1.647-1","1.648-1","1.649-1","1.650-1","1.651-1","1.652-1","1.652-2","1.652-2~deb13u1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-78030.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:H/I:H/A:H"}]}