Integer overflow in Firebirdsql Firebird
CVE-2026-28214
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.
Vulnerability class: Integer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.006 (47.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 47.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.011 · newest: 0.006 · change: -0.005
Affected products
- Firebirdsql Firebird — versions >= 3.0.0, < 3.0.14, >= 4.0.0, < 4.0.7, >= 5.0.0, < 5.0.4
Weakness classification (CWE)
References
- github.com/FirebirdSQL/firebird/security/advisories/GHSA-7cq5-994r-jhrf (Exploit, Vendor Advisory)
- github.com/FirebirdSQL/firebird/releases/tag/v3.0.14 (Release Notes)
- github.com/FirebirdSQL/firebird/releases/tag/v4.0.7 (Release Notes)
- github.com/FirebirdSQL/firebird/releases/tag/v5.0.4 (Release Notes)
Frequently asked questions
- What is CVE-2026-28214?
- CVE-2026-28214 is a medium-severity vulnerability in Firebirdsql Firebird, classified under Integer Overflow or Wraparound. CVSS score: 6.5/10. Published 2026-04-17.
- How severe is CVE-2026-28214?
- Medium severity. CVSS v3 base score is 6.5 out of 10.