CVE-2026-27890

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 class's grow() method computes a negative size value, causing a SIGSEGV crash. An unauthenticated attacker who knows only the server's 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.

References

https://github.com/FirebirdSQL/firebird/security/advisories/GHSA-6crx-4g37-7j49

https://github.com/FirebirdSQL/firebird/releases/tag/v5.0.4

https://github.com/FirebirdSQL/firebird/releases/tag/v4.0.7

https://github.com/FirebirdSQL/firebird/releases/tag/v3.0.14

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3