CVE-2026-15043
CWE-480Published: July 14, 2026· Updated: Jul 14, 2026
Official 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.
Risk Analysis
This critical security issue in DBI::SQL::Nano for Perl, versions from 1.42 before 1.651, incorrectly evaluates SQL operators <= and >= on text, potentially returning incorrect data. With a CVSS score of 9.8, this flaw can lead to incorrect data filtering for policy or authorization, posing a significant risk, but there is no information on exploitation likelihood (EPSS) or confirmed exploitation (KEV).
No public exploit is known for this vulnerability, and it has not been confirmed as exploited by CISA. The vulnerability is remotely exploitable over the network with low attack complexity and requires no privileges or user interaction.
Upgrade DBI::SQL::Nano for Perl to version 1.651 or later. Ensure that applications relying on SQL::Nano for data filtering are thoroughly tested for correct behavior after the update.
Technical Analysis
CVE-2026-15043 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.
A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.
CVSS v3.1 Vector Breakdown
Exploit & PoC Resources
All References (4)
Quick Facts
Related CVEs (CWE-480)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2026-15043 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts