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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 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 Reserved 2026-03-18 | Published 2026-04-17 | Updated 2026-04-17 | Assigner GitHub_M




HIGH: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Problem types

CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

CWE-502: Deserialization of Untrusted Data

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-89mq-229g-x47p

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-2026-33337)

nvd.nist.gov (CVE-2026-33337)

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