Vulnerability · Published Apr 17, 2026 · Assigned by GitHub_M
CVE-2026-28214Firebird server hangs when using specific clumplet on batch creation
Medium 6.0
In plain English
A medium-severity integer overflow in firebird from FirebirdSQL. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.1% (higher than 67% 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, 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | firebird3.0 | no fix listed | DEBIAN-CVE-2026-28214 |
| Debian:13 | firebird3.0 | no fix listed | DEBIAN-CVE-2026-28214 |
| Debian:14 | firebird3.0 | 3.0.14.ds7-1 | DEBIAN-CVE-2026-28214 |
| Debian:13 | firebird4.0 | no fix listed | DEBIAN-CVE-2026-28214 |
| Debian:14 | firebird4.0 | 4.0.7.3271.ds6-1 | DEBIAN-CVE-2026-28214 |
| Ubuntu:22.04:LTS | firebird3.0 | no fix listed | UBUNTU-CVE-2026-28214 |
| Ubuntu:24.04:LTS | firebird3.0 | no fix listed | UBUNTU-CVE-2026-28214 |
| Ubuntu:25.10 | firebird3.0 | no fix listed | UBUNTU-CVE-2026-28214 |
| Ubuntu:26.04:LTS | firebird3.0 | no fix listed | UBUNTU-CVE-2026-28214 |
| Ubuntu:26.10 | firebird3.0 | no fix listed | UBUNTU-CVE-2026-28214 |
| Ubuntu:25.10 | firebird4.0 | no fix listed | UBUNTU-CVE-2026-28214 |
| Ubuntu:26.04:LTS | firebird4.0 | no fix listed | UBUNTU-CVE-2026-28214 |
| Ubuntu:26.10 | firebird4.0 | no fix listed | UBUNTU-CVE-2026-28214 |
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-190, CWE-835 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L
References
- https://github.com/FirebirdSQL/firebird/security/advisories/GHSA-7cq5-994r-jhrf 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