DBI up to 1.655 Table Locking open_data dbm_mldbm/dbm_type denial of service

Summaryinfo

A vulnerability was found in DBI up to 1.655. It has been declared as problematic. This affects the function open_data of the component Table Locking. Such manipulation of the argument dbm_mldbm/dbm_type leads to denial of service. This vulnerability is referenced as CVE-2026-111879. The attack can only be performed from a local environment. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in DBI up to 1.655 and classified as problematic. Affected by this issue is the function open_data of the component Table Locking. The manipulation of the argument dbm_mldbm/dbm_type with an unknown input leads to a denial of service vulnerability. Using CWE to declare the problem leads to CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. Impacted is availability. CVE summarizes:

DBI versions before 1.656 for Perl hang on a later open of a DBD::DBM table because a failed open_data does not release the table's lock. open_data creates the table's lock file and takes an exclusive flock on it for a CREATE, before the checks that can croak: a dbm_mldbm value that is not a module name, a failing tie, or a missing data file. The croak unwinds before the table object is blessed, so nothing releases the lock, and the meta data holding the open descriptor stays cached on the database handle. The dbm_mldbm and dbm_type values come from the DSN or the connect attributes, so a caller that chooses the serializer or the storage backend can trigger the failure. The flock has no timeout, so a later open of that table (even through a separate database handle) blocks for as long as the handle holding the stale lock lives, in the same process or any other.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-111879 since 10/17/2026. The exploitation is known to be easy. Local access is required to approach this attack. Technical details are known, but there is no available exploit.

Upgrading to version 1.656 eliminates this vulnerability.

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Productinfo

Name

• DBI

Version

• 1.655

CPE 2.3info

• 🔒

CPE 2.2info

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