CVE-2026-28214: Firebirdsql Firebird

Medium severity, CVSS 6.5. EPSS: 0.6% chance of exploitation in the next 30 days.

Firebird is an open-source relational database management system. In versions prior to 5.0.4, 4.0.7 and 3.0.14, the ClumpletReader::getClumpletSize() function can overflow the totalLength value when parsing a Wide type clumplet, causing an infinite loop. An authenticated user with INSERT privileges on any table can exploit this via a crafted Batch Parameter Block to cause a denial of service against the server. This issue has been fixed in versions 5.0.4, 4.0.7 and 3.0.14.

Affected products

• Firebirdsql Firebird: before 3.0.14 (fixed in 3.0.14); from 4.0.0, before 4.0.7 (fixed in 4.0.7); from 5.0.0, before 5.0.4 (fixed in 5.0.4)

Published 2026-04-17. Last modified 2026-06-17.