PT-2026-33495 · Firebirdsql · Firebird

Published 2026-04-17 · Updated 2026-04-17 · CVE-2026-40342

NVD

CVSS v3.1

9.9

Critical

AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

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.

Fix

Path traversal

Uncontrolled Search Path Element

Code Injection

Weakness Enumeration

CWE-22

CWE-427

CWE-94

CWE-73

Related Identifiers

CVE-2026-40342

Affected Products

Firebird

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2026-40342 · Security Note
• https://github.com/FirebirdSQL/firebird/security/advisories/GHSA-7pxc-h3rv-r257 · Note
• https://github.com/FirebirdSQL/firebird/releases/tag/v3.0.14 · Note
• https://github.com/FirebirdSQL/firebird/releases/tag/v5.0.4 · Note
• https://github.com/FirebirdSQL/firebird/releases/tag/v4.0.7 · Note