CVE-2026-15043

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.

CVSS Metrics

• v3.1•CRITICAL•Score: 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Techniques & Countermeasures

• CWE-480•Use of Incorrect Operator

  The product accidentally uses the wrong operator, which changes the logic in security-relevant ways.

Affected Systems

• hmbrand•dbi::sql::nano

  ≥ 1.42, < 1.651

References (3)

• https://github.com/perl5-dbi/dbi/security/advisories/GHSA-mv45-ff6j-x9jp
• https://github.com/perl5-dbi/dbi/commit/e9742ef85a75867cbd696860e3bf3e32b681f98d.patch
• http://www.openwall.com/lists/oss-security/2026/07/14/9