CVE-2026-34232

Firebird: DoS via `op_response` packet from client

State: Published
Severity: 7.5 High
Published: Apr 17, 2026
Updated: Apr 20, 2026
Reserved: Mar 26, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	GitHub_M

Weaknesses

CWE-228 Improper Handling of Syntactically Invalid Structure

Affected Products

Product	Versions
firebirdFirebirdSQL	>= 3.0.0, < 3.0.14Affected >= 4.0.0, < 4.0.7Affected >= 5.0.0, < 5.0.4Affected

References

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