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    CVE-2026-27890

    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:Apr 17, 2026
    Last Modified:Apr 24, 2026
    EPS:Apr 17, 2026
    EPSS Score:0.0011
    CVSS Score:8.2

    Affected Products

    Vendor
    Firebirdsql
    Product
    Firebird

    Exploits

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

    Related CVEs

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    CVE-2026-28224 (CVSS 8.2) — Firebird is an open-source relational database management system. In versions prior to 5.0.4, 4.0.7 and 3.0.14…
    CVE-2026-28214 (CVSS 6) — Firebird is an open-source relational database management system. In versions prior to 5.0.4, 4.0.7 and 3.0.14…
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    CVE-2025-24975 (CVSS 7.1) — Firebird is a relational database. Prior to snapshot versions 4.0.6.3183, 5.0.2.1610, and 6.0.0.609, Firebird …
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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High