CVE-2026-111879 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.
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-111879?
CVE-2026-111879 is a vulnerability, published on 20 Oct 2026.
Official description
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.
Weakness: CWE-667
Which versions are affected by CVE-2026-111879?
How do I fix CVE-2026-111879?
Upgrade to a fixed version.
Is CVE-2026-111879 being exploited?
There is no known exploitation of CVE-2026-111879 in the wild and no public exploit code.
Sources
Also known as AZL-110061, BELL-CVE-2026-111879, DEBIAN-CVE-2026-111879, ECHO-d873-e290-330f, GHSA-8cx8-9vj9-9x7j, UBUNTU-CVE-2026-111879.