Security Advisory

CVE-2026-27890

CVE vulnerability detail — eXtreme Datacenter Security Operations

Published 2026-04-17 18:14:29

Last updated 2026-04-17 18:50:22

Assigner GitHub_M

State PUBLISHED

Description

Firebird is an open-source relational database management system. In versions prior to 5.0.4, 4.0.7 and 3.0.14, when processing CNCT_specific_data segments during authentication, the server assumes segments arrive in strictly ascending order. If segments arrive out of order, the Array classs grow() method computes a negative size value, causing a SIGSEGV crash. An unauthenticated attacker who knows only the servers IP and port can exploit this to crash the server. This issue has been fixed in versions 5.0.4, 4.0.7 and 3.0.14.

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