Vulnerability · Published Apr 17, 2026 · Assigned by GitHub_M
CVE-2026-28224Firebird Null Pointer Dereference via CryptCallback causes DOS
High 8.2
In plain English
A high-severity null pointer dereference in firebird from FirebirdSQL. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 40% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | firebird3.0 | no fix listed | DEBIAN-CVE-2026-28224 |
| Debian:13 | firebird3.0 | no fix listed | DEBIAN-CVE-2026-28224 |
| Debian:14 | firebird3.0 | 3.0.14.ds7-1 | DEBIAN-CVE-2026-28224 |
| Debian:13 | firebird4.0 | no fix listed | DEBIAN-CVE-2026-28224 |
| Debian:14 | firebird4.0 | 4.0.7.3271.ds6-1 | DEBIAN-CVE-2026-28224 |
| Ubuntu:22.04:LTS | firebird3.0 | no fix listed | UBUNTU-CVE-2026-28224 |
| Ubuntu:24.04:LTS | firebird3.0 | no fix listed | UBUNTU-CVE-2026-28224 |
| Ubuntu:25.10 | firebird3.0 | no fix listed | UBUNTU-CVE-2026-28224 |
| Ubuntu:26.04:LTS | firebird3.0 | no fix listed | UBUNTU-CVE-2026-28224 |
| Ubuntu:26.10 | firebird3.0 | no fix listed | UBUNTU-CVE-2026-28224 |
| Ubuntu:25.10 | firebird4.0 | no fix listed | UBUNTU-CVE-2026-28224 |
| Ubuntu:26.04:LTS | firebird4.0 | no fix listed | UBUNTU-CVE-2026-28224 |
| Ubuntu:26.10 | firebird4.0 | no fix listed | UBUNTU-CVE-2026-28224 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| FirebirdSQL | firebird | >= 3.0.0, < 3.0.14>= 4.0.0, < 4.0.7>= 5.0.0, < 5.0.4 |
Weakness: CWE-476 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
References
- https://github.com/FirebirdSQL/firebird/security/advisories/GHSA-xrcw-wpjx-pr95 x_refsource_CONFIRM
- https://github.com/FirebirdSQL/firebird/releases/tag/v3.0.14 x_refsource_MISC
- https://github.com/FirebirdSQL/firebird/releases/tag/v4.0.7 x_refsource_MISC
- https://github.com/FirebirdSQL/firebird/releases/tag/v5.0.4 x_refsource_MISC