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
- CVSS 3.1 7.5 High
- Status
- Analyzed - security-advisories@github.com
- Published
- 2026-04-17
- Last modified
- 2026-10-26
- Weaknesses
- CWE-120, CWE-502
Affected products
References
- https://github.com/FirebirdSQL/firebird/security/advisories/GHSA-89mq-229g-x47p
- https://github.com/FirebirdSQL/firebird/releases/tag/v3.0.14
- https://github.com/FirebirdSQL/firebird/releases/tag/v4.0.7
- https://github.com/FirebirdSQL/firebird/releases/tag/v5.0.4
