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 processing CNCT_specific_data segments during authentication, the server assumes segments arrive in strictly ascending order. If segments arrive out of order, the Array class's grow() method computes a negative size value, causing a SIGSEGV 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
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| FirebirdSQL | firebird | >= 3.0.0, < 3.0.14, >= 4.0.0, < 4.0.7, >= 5.0.0, < 5.0.4 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | firebird3.0 | 3.0.14.ds7-1 | — |
| Debian 14 | firebird4.0 | 4.0.7.3271.ds6-1 | — |
| Debian 13 | firebird3.0 +1 | No fix yet | — |
| Debian 12 | firebird3.0 | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | firebird3.0 +1 | No fix yet | — |
| Ubuntu 26.04 LTS | firebird3.0 +1 | No fix yet | — |
| Ubuntu 25.10 | firebird3.0 +1 | No fix yet | — |
| Ubuntu 24.04 LTS | firebird3.0 | No fix yet | — |
| Ubuntu 22.04 LTS | firebird3.0 | No fix yet | — |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | firebird3.0 | No fix yet | — |
| Ubuntu 18.04 LTS | firebird3.0 | No fix yet | — |