High severity · published Apr 17, 2026
CVE-2026-34232
Firebird: DoS via `op_response` packet from client
7.5
CVSS
0.5%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 40% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FI
firebird · FirebirdSQL
>= 3.0.0, < 3.0.14; >= 4.0.0, < 4.0.7; >= 5.0.0, < 5.0.4 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-34232
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-34232
Release Notes
https://github.com/FirebirdSQL/firebird/releases/tag/v3.0.14
Release Notes
https://github.com/FirebirdSQL/firebird/releases/tag/v4.0.7
Release Notes
https://github.com/FirebirdSQL/firebird/releases/tag/v5.0.4
Exploit
https://github.com/FirebirdSQL/firebird/security/advisories/GHSA-7jq3-6j3c-5cm2
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