FirebirdSQL Firebird up to 3.0.13/4.0.6/5.0.3 op_crypt_key_callback null pointer dereference

Summaryinfo

A vulnerability identified as problematic has been detected in FirebirdSQL Firebird up to 3.0.13/4.0.6/5.0.3. The impacted element is the function op_crypt_key_callback. Performing a manipulation results in null pointer dereference. This vulnerability is identified as CVE-2026-28224. The attack can be initiated remotely. There is not any exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic has been found in FirebirdSQL Firebird up to 3.0.13/4.0.6/5.0.3. This affects the function op_crypt_key_callback. The manipulation with an unknown input leads to a null pointer dereference vulnerability. CWE is classifying the issue as CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. This is going to have an impact on availability. The summary by CVE is:

Firebird is an open-source relational database management system. In versions prior to 5.0.4, 4.0.7 and 3.0.14, when the server receives an op_crypt_key_callback packet without prior authentication, the port_server_crypt_callback handler is not initialized, resulting in a null pointer dereference and server crash. An unauthenticated attacker who knows only the server's IP and port can exploit this to crash the server. This issue has been fixed in versions 5.0.4, 4.0.7 and 3.0.14.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-28224 since 02/25/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 307403 (Linux Distros Unpatched Vulnerability : CVE-2026-28224), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 3.0.14, 4.0.7 or 5.0.4 eliminates this vulnerability. The upgrade is hosted for download at github.com.

The vulnerability is also documented in the vulnerability database at Tenable (307403). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• Database Administration Software

Vendor

• FirebirdSQL

Name

• Firebird

Version

• 3.0.0
• 3.0.1
• 3.0.2
• 3.0.3
• 3.0.4
• 3.0.5
• 3.0.6
• 3.0.7
• 3.0.8
• 3.0.9
• 3.0.10
• 3.0.11
• 3.0.12
• 3.0.13
• 4.0.0
• 4.0.1
• 4.0.2
• 4.0.3
• 4.0.4
• 4.0.5
• 4.0.6
• 5.0.0
• 5.0.1
• 5.0.2
• 5.0.3

License

• open-source

Website

• Product: https://github.com/FirebirdSQL/firebird/

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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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