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    CVE-2026-33337

    Firebird is an open-source relational database management system. In versions prior to 5.0.4, 4.0.7 and 3.0.14, when deserializing a slice packet, the xdr_datum() function does not validate that a cstring length conforms to the slice descriptor bounds, allowing a cstring longer than the allocated buffer to overflow it. An unauthenticated attacker can exploit this by sending a crafted packet to the server, potentially causing a crash or other security impact. This issue has been fixed in versions 5.0.4, 4.0.7 and 3.0.14.

    Published:Apr 17, 2026
    Last Modified:Apr 27, 2026
    EPS:Apr 17, 2026
    EPSS Score:0.00054
    CVSS Score:7.5

    Affected Products

    Vendor
    Firebirdsql
    Product
    Firebird

    Exploits

    https://github.com/FirebirdSQL/firebird/security/advisories/GHSA-89mq-229g-x47p

    Related CVEs

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    CVE-2026-34232 (CVSS 7.5) — Firebird is an open-source relational database management system. In versions prior to 5.0.4, 4.0.7 and 3.0.14…
    CVE-2026-28224 (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…
    CVE-2026-27890 (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-2026-28212 (CVSS 7.5) — Firebird is an open-source relational database management system. In versions prior to 6.0.0, 5.0.4, 4.0.7 and…
    CVE-2025-65104 (CVSS 7.9) — Firebird is an open-source relational database management system. In versions FB3 of the client library placed…
    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 …
    CVE-2025-54989 (CVSS 5.3) — Firebird is a relational database. Prior to versions 3.0.13, 4.0.6, and 5.0.3, there is an XDR message parsing…

    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