Integer overflow in Firebird - CVE-2026-28214

Vulnerability identifier: #VU126556

CSH Severity: Low

CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-28214

CWE-ID: CWE-190

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote user to cause a denial of service.

The vulnerability exists due to an integer overflow in ClumpletReader::getClumpletSize() when parsing a batch parameter block clumplet during batch creation. A remote user can send a specially crafted batch parameter block to cause a denial of service.

Exploitation requires valid authentication and INSERT privilege on a table.

Firebird
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Package Hub 15
firebird
firebird-debugsource
libib_util
firebird-examples
libfbclient2
libib_util-debuginfo
firebird-utils
firebird-server
libib_util-devel
libfbclient2-debuginfo
firebird-server-debuginfo
firebird-utils-debuginfo
libfbclient-devel
firebird-debuginfo

Install security update from vendor's website.

Firebird - addressed in versions 3.0.14, 4.0.7, 5.0.4
firebird - update to 3.0.14.33856-150200.3.9.1
firebird-debugsource - update to 3.0.14.33856-150200.3.9.1
libib_util - update to 3.0.14.33856-150200.3.9.1
firebird-examples - update to 3.0.14.33856-150200.3.9.1
libfbclient2 - update to 3.0.14.33856-150200.3.9.1
libib_util-debuginfo - update to 3.0.14.33856-150200.3.9.1
firebird-utils - update to 3.0.14.33856-150200.3.9.1
firebird-server - update to 3.0.14.33856-150200.3.9.1
libib_util-devel - update to 3.0.14.33856-150200.3.9.1
libfbclient2-debuginfo - update to 3.0.14.33856-150200.3.9.1
firebird-server-debuginfo - update to 3.0.14.33856-150200.3.9.1
firebird-utils-debuginfo - update to 3.0.14.33856-150200.3.9.1
libfbclient-devel - update to 3.0.14.33856-150200.3.9.1
firebird-debuginfo - update to 3.0.14.33856-150200.3.9.1

• https://github.com/FirebirdSQL/firebird/security/advisories/GHSA-7cq5-994r-jhrf

• Multiple vulnerabilities in Firebird
• SUSE update for firebird