What’s Vulnerable › Vulnerabilities

CVE-2026-28224: Firebird Null Pointer Dereference via CryptCallback causes DOS

• Severity: high (CVSS 8.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-04-17 · updated 2026-10-26
• Weakness: CWE-476

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 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.

Affected products

• FirebirdSQL firebird: before 3.0.14; from 4.0.0 before 4.0.7; from 5.0.0 before 5.0.4 — fixed in 3.0.14, 4.0.7, 5.0.4

How to fix

Upgrade to a fixed version: FirebirdSQL firebird 3.0.14, 4.0.7, 5.0.4. Check the vendor advisory for mitigations.

References

• 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
• https://github.com/FirebirdSQL/firebird/security/advisories/GHSA-xrcw-wpjx-pr95
• https://github.com/FirebirdSQL/firebird/security/advisories/GHSA-xrcw-wpjx-pr95

Get alerted when CVE-2026-28224 or the next vulnerability affects your stack