CVE-2026-33337
Firebird has a buffer overflow when parsing corrupted slice packets
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.
INFO
Published Date :
April 17, 2026, 7:16 p.m.
Last Modified :
April 27, 2026, 2:26 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update Firebird to version 5.0.4 or later.
- Update Firebird to version 4.0.7 or later.
- Update Firebird to version 3.0.14 or later.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-33337.
| URL | Resource |
|---|---|
| https://github.com/FirebirdSQL/firebird/releases/tag/v3.0.14 | Release Notes |
| https://github.com/FirebirdSQL/firebird/releases/tag/v4.0.7 | Release Notes |
| https://github.com/FirebirdSQL/firebird/releases/tag/v5.0.4 | Release Notes |
| https://github.com/FirebirdSQL/firebird/security/advisories/GHSA-89mq-229g-x47p | Exploit Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-33337 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-33337
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-33337 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-33337 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Apr. 27, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:firebirdsql:firebird:*:*:*:*:*:*:*:* versions from (including) 4.0.0 up to (excluding) 4.0.7 *cpe:2.3:a:firebirdsql:firebird:*:*:*:*:*:*:*:* versions from (including) 5.0.0 up to (excluding) 5.0.4 *cpe:2.3:a:firebirdsql:firebird:*:*:*:*:*:*:*:* versions from (including) 3.0.0 up to (excluding) 3.0.14 Added Reference Type GitHub, Inc.: https://github.com/FirebirdSQL/firebird/releases/tag/v3.0.14 Types: Release Notes Added Reference Type GitHub, Inc.: https://github.com/FirebirdSQL/firebird/releases/tag/v4.0.7 Types: Release Notes Added Reference Type GitHub, Inc.: https://github.com/FirebirdSQL/firebird/releases/tag/v5.0.4 Types: Release Notes Added Reference Type GitHub, Inc.: https://github.com/FirebirdSQL/firebird/security/advisories/GHSA-89mq-229g-x47p Types: Exploit, Vendor Advisory -
New CVE Received by [email protected]
Apr. 17, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-502 Added CWE CWE-120 Added Reference https://github.com/FirebirdSQL/firebird/releases/tag/v3.0.14 Added Reference https://github.com/FirebirdSQL/firebird/releases/tag/v4.0.7 Added Reference https://github.com/FirebirdSQL/firebird/releases/tag/v5.0.4 Added Reference https://github.com/FirebirdSQL/firebird/security/advisories/GHSA-89mq-229g-x47p