Buffer overflow in Firebird - CVE-2026-33337
Published: April 20, 2026
Vulnerability identifier: #VU126552
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-2026-33337
CWE-ID: CWE-120
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 a buffer overflow in xdr_datum() when parsing a corrupted slice packet. A remote attacker can send a specially crafted slice packet to cause a denial of service.
The issue occurs when a cstring length is not checked against the slice descriptor or the entire slice length before being written into a slice-sized buffer.
How to mitigate CVE-2026-33337
Install security update from vendor's website.