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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-111879
StatePUBLISHED
AssignerCPANSec
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-20 22:18:48 UTC
Updated2026-10-20 22:18:48 UTC
DescriptionDBI 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.

Risk And Classification

Problem Types: CWE-667 | CWE-667 CWE-667 Improper Locking

References

ReferenceSourceLinkTags
github.com/perl5-dbi/dbi/commit/99bbf2ab9d137e6f042a770bd3bbba3bc0b3a901... 9b29abf9-4ab0-4765-b253-1875cd9b441e github.com
github.com/perl5-dbi/dbi/security/advisories/GHSA-8cx8-9vj9-9x7j 9b29abf9-4ab0-4765-b253-1875cd9b441e github.com
metacpan.org/release/HMBRAND/DBI-1.656/changes 9b29abf9-4ab0-4765-b253-1875cd9b441e metacpan.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

Solutions

CNA: Upgrade to DBI 1.656 or later.

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