CVE-2026-33337
Firebird has a buffer overflow when parsing corrupted slice packets
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-120 CWE-502 |
| Vendor | firebirdsql |
| Product | firebird |
| Published | Apr 17, 2026 |
| Last Updated | Apr 17, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
FirebirdSQL / firebird
>= 3.0.0, < 3.0.14 >= 4.0.0, < 4.0.7 >= 5.0.0, < 5.0.4
References
github.com: https://github.com/FirebirdSQL/firebird/security/advisories/GHSA-89mq-229g-x47p github.com: https://github.com/FirebirdSQL/firebird/releases/tag/v3.0.14 github.com: https://github.com/FirebirdSQL/firebird/releases/tag/v4.0.7 github.com: https://github.com/FirebirdSQL/firebird/releases/tag/v5.0.4