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CVE details

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.

Score
7.5 high
Published
2026-04-17
Links
NVD · cve.org

Affected ports (4)

PortPackageVersionStatusMaintainer
databases/firebird30-clientfirebird30-client3.0.12unaddressedacm@FreeBSD.org
databases/firebird30-serverfirebird30-server3.0.12unaddressedacm@FreeBSD.org
databases/firebird40-clientfirebird40-client4.0.5_2unaddressedacm@FreeBSD.org
databases/firebird40-serverfirebird40-server4.0.5_2unaddressedacm@FreeBSD.org

Template for a VuXML entry

Range taken from the CVE record, check it before committing. make newentry in security/vuxml creates the vid.

  <vuln vid="FIXME (make newentry)">
    <topic>FIXME -- FIXME</topic>
    <affects>
      <package>
	<name>firebird30-client</name>
	<range><lt>3.0.14</lt></range>
      </package>
      <package>
	<name>firebird30-server</name>
	<range><lt>3.0.14</lt></range>
      </package>
      <package>
	<name>firebird40-client</name>
	<range><lt>3.0.14</lt></range>
      </package>
      <package>
	<name>firebird40-server</name>
	<range><lt>3.0.14</lt></range>
      </package>
    </affects>
    <description>
      <body xmlns="http://www.w3.org/1999/xhtml">
	<p>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.</p>
      </body>
    </description>
    <references>
      <cvename>CVE-2026-33337</cvename>
      <url>https://nvd.nist.gov/vuln/detail/CVE-2026-33337</url>
    </references>
    <dates>
      <discovery>2026-04-17</discovery>
      <entry>2026-10-25</entry>
    </dates>
  </vuln>