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->connect( $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.
Analysis and contextual insights are available on OpenCVE Cloud.
Vendor Solution
Upgrade to DBI version 1.653 or later, or apply the upstream patch.
Tracking
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Sun, 20 Sep 2026 01:30:00 +0000
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Sun, 20 Sep 2026 01:15:00 +0000
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Perl5-dbi
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Perl5-dbi
Perl5-dbi dbi |
Sat, 19 Sep 2026 18:30:00 +0000
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Sat, 19 Sep 2026 11:00:00 +0000
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| Description | 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->connect( $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. | |
| Title | DBI versions before 1.653 for Perl load arbitrary modules via unvalidated dbm_type and dbm_mldbm attributes in DBD::DBM | |
| Weaknesses | CWE-470 | |
| References |
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Status: PUBLISHED
Assigner: CPANSec
Published:
Updated: 2026-09-20T00:05:29.533Z
Reserved: 2026-08-22T00:39:23.300Z
Link: CVE-2026-78030
Updated: 2026-09-20T00:05:20.327Z
Status : Received
Published: 2026-09-19T11:16:37.667
Modified: 2026-09-20T01:16:30.017
Link: CVE-2026-78030
No data.
OpenCVE Enrichment
Updated: 2026-09-20T02:30:17Z