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: 0.007 (48.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.9 (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
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
- security-advisories@github.com (x_refsource_MISC, Release Notes)
- security-advisories@github.com (x_refsource_MISC, Release Notes)
- security-advisories@github.com (x_refsource_MISC, Release Notes)
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: 9.9/10. Published 2026-04-17.
- How severe is CVE-2026-40342?
- Critical severity. CVSS v3 base score is 9.9 out of 10.