CVE-2026-34232 HIGH

CVE-2026-34232: Firebird: DoS via `op_response` packet from client

Vendor Firebirdsql
Product firebird
Weakness CWE-228
Published April 17, 2026
Last update April 20, 2026

CVSS base score

7.5/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality None
Integrity None

CVSS vector

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

What the vulnerability does

01Description

Firebird is an open-source relational database management system. In versions prior to 5.0.4, 4.0.7 and 3.0.14, the xdr_status_vector() function does not handle the isc_arg_cstring type when decoding an op_response packet, causing a server crash when one is encountered in the status vector. An unauthenticated attacker can exploit this by sending a crafted op_response packet to the server. This issue has been fixed in versions 5.0.4, 4.0.7 and 3.0.14.

Key dates

02Disclosure timeline

April 17, 2026 CVE published
April 20, 2026 Record updated