by Kastro
Paper/Archive/CVE-2026-40342

CVE-2026-40342

FirebirdSQL firebird — Firebird: Path Traversal + Arbitrary File Write Leads to Remote Code Execution

EPSS 0.7%CVSS 10.0
critical.is priorityof 100
41
CVSS 10.0 (CNA)10.0 / 10 × 3030.0Not in CISA KEV+300.0EPSS percentile 52.9.529 × 2010.6No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
firebird< 3.0.14–CNA
firebird>= 4.0.0, < 4.0.7–CNA
firebird>= 5.0.0, < 5.0.4–CNA

Scores by source

GitHub_M (CNA)10.0CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

refgithub.com/FirebirdSQL/firebird/security/advisories/GHSA-7pxc-h3rv-r257refgithub.com/FirebirdSQL/firebird/releases/tag/v3.0.14refgithub.com/FirebirdSQL/firebird/releases/tag/v4.0.7refgithub.com/FirebirdSQL/firebird/releases/tag/v5.0.4