firebird3.0: Firebird is an open-source relational database management system
CVE-2026-27890 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-27890, released May 15, 2026. It is not reported as exploited. Patch Radar priority: High.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| firebird3.0 · Debian 14 | 3.0.14.ds7-1 | DEBIAN-CVE-2026-27890 | May 15, 2026 |
| firebird4.0 · Debian 14 | 4.0.7.3271.ds6-1 | DEBIAN-CVE-2026-27890 | May 15, 2026 |
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