🛡️ CVE-2026-27890
🟠 CVSS 8.2 — High ⚠️ Exploit Public CWE-119 NVD
8.2
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Firebird is an open-source relational database management system. In versions prior to 5.0.4, 4.0.7 and 3.0.14, when processing CNCT_specific_data segments during authentication, the server assumes segments arrive in strictly ascending order. If segments arrive out of order, the Array class's grow() method computes a negative size value, causing a SIGSEGV crash. An unauthenticated attacker who knows only the server's IP and port can exploit this to crash the server. This issue has been fixed in versions 5.0.4, 4.0.7 and 3.0.14.

Details

Severity HIGH
CVSS Score 8.2
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
CWE CWE-119
Public Exploit ⚠️ Yes
Source NVD
Published 2026-04-17
Updated 2026-06-02
Modified 2026-04-24
Fix URL N/A

Affected Packages

Software From version Fixed in
firebird 5.0.0 5.0.4

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