CVE-2026-35215: Firebirdsql Firebird

High severity, CVSS 7.5. EPSS: 0.7% 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 sdl_desc() function does not validate the length of a decoded SDL descriptor from a slice packet. A zero-length descriptor is later used to calculate the number of slice items, causing a division by zero. An unauthenticated attacker can exploit this by sending a crafted slice packet to crash the server. This issue has been fixed in versions 5.0.4, 4.0.7 and 3.0.14.

Affected products

• Firebirdsql Firebird: from 3.0.0, 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.