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

> Inverted SQL comparison operators in DBI::SQL::Nano allow attackers to bypass authorization filters or retrieve incorrect data from file-backed databases.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 14 Jul 2026
- **Updated:** 14 Jul 2026
- **Also known as:** ALPINE-CVE-2026-15043, AZL-92418, BELL-CVE-2026-15043, DEBIAN-CVE-2026-15043, ECHO-8689-040b-7485, GHSA-mv45-ff6j-x9jp, MINI-73pp-342x-94f9, UBUNTU-CVE-2026-15043

## What is CVE-2026-15043?

CVE-2026-15043 is a critical vulnerability in HMBRAND DBI::SQL::Nano, published on 14 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### 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.

Weakness: CWE-480 (Use of Incorrect Operator)

## Which versions are affected by CVE-2026-15043?


## How do I fix CVE-2026-15043?

Upgrade to a fixed version.

## Is CVE-2026-15043 being exploited?

There is no known exploitation of CVE-2026-15043 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-15043 and fix it if it is affected.

What it is: CVE-2026-15043 is a critical vulnerability in HMBRAND DBI::SQL::Nano, published on 14 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-15043 in the wild and no public exploit code.

Affected product: HMBRAND DBI::SQL::Nano. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-15043/ (Markdown: https://insights.sbomify.com/CVE-2026-15043/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-15043
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-15043
- OSV: https://osv.dev/vulnerability/CVE-2026-15043

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-15043/
Summaries are generated and may contain mistakes; the official description above is the record.