Description
DBI::SQL::Nano versions from 1.42 before 1.651 for Perl have inverted <= and >= SQL operators on text. DBI::SQL::Nano, DBI's built-in mini-SQL engine, evaluated WHERE predicates incorrectly in some cases. In the non-numeric string branch of the is_matched method, <= was evaluated using Perl's ge operator, and >= was evaluated using Perl's le operator. SQL::Nano is the fallback query engine for DBI's file-backed drivers (DBD::File, DBD::DBM, CSV-style drivers) whenever SQL::Statement is not installed, and is forced whenever DBI_SQL_NANO=1. Queries over such tables use these predicates directly. The impact depends on the context. Where an application relies on a WHERE clause to filter file-backed data for policy or authorization, an inverted <=/>= comparison silently returns the wrong rows.
References
- www.cve.org/CVERecord ↗
- nvd.nist.gov/vuln/detail/CVE-2026-15043 ↗
- github.com/perl5-dbi/dbi/commit/e9742ef85a75867cbd696860e3bf3e32b681f98d.patch ↗
- github.com/perl5-dbi/dbi/security/advisories/GHSA-mv45-ff6j-x9jp ↗
- metacpan.org/release/HMBRAND/DBI-1.651/changes ↗
- www.openwall.com/lists/oss-security/2026/07/14/9 ↗
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