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CVE-2026-27890

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CVE-2026-27890

Published: Apr 17, 2026

Modified: Apr 17, 2026

PUBLISHED

CVSS v3.1

8.2

HIGH

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.

VendorProductVersions

FirebirdSQL

firebird

affected
>= 3.0.0, < 3.0.14
affected
>= 4.0.0, < 4.0.7
affected
>= 5.0.0, < 5.0.4

Weaknesses (CWE)

CWE-119
CWE-787

CVSS v3.1 Details

CVSS v3.1 Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

High

References

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