CVE-2026-28214
Medium
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.
SeverityMedium
CVSS6.5
Exploit probability—
ProductFirebird
PublishedApr 17, 2026
First seenApr 17, 2026
Weakness typeCWE-190Integer overflowCWE-835CWE-835
How to fix
Update
- firebirdsql firebird3.0.14, 4.0.7, 5.0.4 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| firebirdsql firebird | v < 3.0.14, 4.0.0 ≤ v < 4.0.7, 5.0.0 ≤ v < 5.0.4 | 3.0.14, 4.0.7, 5.0.4 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.