Input validation error in Firebird - CVE-2026-34232
Published: April 20, 2026
Vulnerability identifier: #VU126551
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-34232
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: firebird.sourceforge.net
Affected software:
Firebird
Firebird
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper input validation in xdr_status_vector() when parsing an op_response packet containing isc_arg_cstring in the status vector. A remote attacker can send a specially crafted packet to cause a denial of service.
The issue can crash the server while decoding a client-supplied op_response packet, even though such a request is later dropped in loopThread().
How to mitigate CVE-2026-34232
Install security update from vendor's website.