# CVE-2026-15043: DBI::SQL::Nano versions from 1.42 before 1.651 for Perl have inverted <= and >= SQL operators on text

CVE-2026-15043 is fixed in 5 products on 1 platform, first by DEBIAN-CVE-2026-15043, released July 18, 2026. It is not reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/cve/CVE-2026-15043
- Priority: Urgent
- CVSS: 9.8 (Critical)
- EPSS: 0.0067
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 14, 2026
- Weakness: Use of Incorrect Operator
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libdbi-perl Debian 12.15 (bookworm) | 1.643-4+deb12u2 | [DEBIAN-CVE-2026-15043](https://patchblox.com/security/data/fix/linux/debian-cve-2026-15043.md) | Jul 18, 2026 |
| Linux | libdbi-perl Debian 13.5 (trixie) | 1.652-2~deb13u1 | [DEBIAN-CVE-2026-15043](https://patchblox.com/security/data/fix/linux/debian-cve-2026-15043.md) | Jul 18, 2026 |
| Linux | libdbi-perl Debian 14 | 1.651-1 | [DEBIAN-CVE-2026-15043](https://patchblox.com/security/data/fix/linux/debian-cve-2026-15043.md) | Jul 18, 2026 |
| Linux | perl-DBI amzn 2023 | 1.651-1.amzn2023.0.1 | [ALAS2023-2026-2006](https://patchblox.com/security/data/fix/linux/alas2023-2026-2006.md) | Aug 3, 2026 |
| Linux | perl-DBI opensuse-leap 16.0 | 1.647.0-160000.5.1 | [OPENSUSE-SU-2026:21412-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21412-1.md) | Jul 22, 2026 |
| Linux | perl-DBI sles 15.6 | 1.647.0-150600.12.18.1 | [SUSE-SU-2026:3415-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3415-1.md) | Jul 30, 2026 |
| Linux | perl-DBI sles 15.7 | 1.647.0-150600.12.18.1 | [SUSE-SU-2026:3415-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3415-1.md) | Jul 30, 2026 |
| Linux | perl-DBI sles 16.0 | 1.647.0-160000.5.1 | [SUSE-SU-2026:22845-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-22845-1.md) | Jul 22, 2026 |
| Linux | perl-DBI-debuginfo amzn 2023 | 1.651-1.amzn2023.0.1 | [ALAS2023-2026-2006](https://patchblox.com/security/data/fix/linux/alas2023-2026-2006.md) | Aug 3, 2026 |
| Linux | perl-DBI-debugsource amzn 2023 | 1.651-1.amzn2023.0.1 | [ALAS2023-2026-2006](https://patchblox.com/security/data/fix/linux/alas2023-2026-2006.md) | Aug 3, 2026 |
| Linux | perl-DBI-tests amzn 2023 | 1.651-1.amzn2023.0.1 | [ALAS2023-2026-2006](https://patchblox.com/security/data/fix/linux/alas2023-2026-2006.md) | Aug 3, 2026 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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