Description
Firebird is an open-source relational database management system. In versions prior to 5.0.4, 4.0.7 and 3.0.14, the ClumpletReader::getClumpletSize() function can overflow the totalLength value when parsing a Wide type clumplet, causing an infinite loop. An authenticated user with INSERT privileges on any table can exploit this via a crafted Batch Parameter Block to cause a denial of service against 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 | — |
Advisories 1
- WID-SEC-2026-1171 Firebird: Mehrere Schwachstellen BSI CERT-Bund (WID) · May 17, 2026