CVE-2026-34232CWE-228

Firebird: DoS via `op_response` packet from client

High · published April 17, 2026

CVSS v3.1
7.5
EPSS
1%
Percentile
52.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00695 · 52.4th percentile
Weakness
CWE-228 · Improper Handling of Syntactically Invalid Structure
Published
2026-04-17T18:52Z
EPSS history
Timeline
  • 17 APR 18:52Z
    Firebird: DoS via `op_response` packet from client
    cvelistv5