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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.

PUBLISHED Reserved 2026-02-24 | Published 2026-04-17 | Updated 2026-04-17 | Assigner GitHub_M




HIGH: 8.2CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

Problem types

CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer

CWE-787: Out-of-bounds Write

Product status

>= 3.0.0, < 3.0.14
affected

>= 4.0.0, < 4.0.7
affected

>= 5.0.0, < 5.0.4
affected

References

github.com/...rebird/security/advisories/GHSA-6crx-4g37-7j49

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

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

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

cve.org (CVE-2026-27890)

nvd.nist.gov (CVE-2026-27890)

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