RCE in Firebirdsql Firebird
CVE-2026-40342
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 separa…
Vulnerability class: Path Traversal (Directory Traversal)
EPSS: 0.001 (35.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.
Affected products
- Firebirdsql Firebird — versions < 3.0.14, >= 4.0.0, < 4.0.7, >= 5.0.0, < 5.0.4
Weakness classification (CWE)
References
- https://github.com/FirebirdSQL/firebird/security/advisories/GHSA-7pxc-h3rv-r257 (x_refsource_CONFIRM)
- https://github.com/FirebirdSQL/firebird/releases/tag/v3.0.14 (x_refsource_MISC)
- https://github.com/FirebirdSQL/firebird/releases/tag/v4.0.7 (x_refsource_MISC)
- https://github.com/FirebirdSQL/firebird/releases/tag/v5.0.4 (x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-40342?
- CVE-2026-40342 is a critical-severity vulnerability in Firebirdsql Firebird, classified under Path Traversal. CVSS score: 10.0/10. Published 2026-04-17.
- How severe is CVE-2026-40342?
- Critical severity. CVSS v3 base score is 10.0 out of 10.