# CVE-2026-40342: firebird3.0: Firebird is an open-source relational database management system

CVE-2026-40342 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-40342, released May 15, 2026. It is not reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/cve/CVE-2026-40342
- Priority: Urgent
- CVSS: 9.9 (critical)
- EPSS: 0.0069
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 17, 2026

## Description

Firebird is an open-source relational database management system. In versions prior to 5.0.4, 4.0.7 and 3.0.14, the external engine plugin loader concatenates a user-supplied engine name into a filesystem path without filtering path separators or .. components. An authenticated user with CREATE FUNCTION privileges can use a crafted ENGINE name to load an arbitrary shared library from anywhere on the filesystem via path traversal. The library's initialization code executes immediately during loading, before Firebird validates the module, achieving code execution as the server's OS account. This issue has been fixed in versions 5.0.4, 4.0.7 and 3.0.14.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | firebird3.0 Debian 14 | 3.0.14.ds7-1 | [DEBIAN-CVE-2026-40342](https://patchblox.com/security/data/fix/linux/debian-cve-2026-40342.md) | May 15, 2026 |
| Linux | firebird4.0 Debian 14 | 4.0.7.3271.ds6-1 | [DEBIAN-CVE-2026-40342](https://patchblox.com/security/data/fix/linux/debian-cve-2026-40342.md) | May 15, 2026 |

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Data as of 2026-11-08T00:53:09Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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