CVE-2026-28214 Details
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.
A denial-of-service vulnerability has been identified in Firebird, an open-source relational database management system. This issue affects versions prior to 5.0.4, 4.0.7, and 3.0.14. The vulnerability arises in the ClumpletReader::getClumpletSize() function, where improper handling of 'Wide' type clumplets can lead to an overflow of the totalLength variable, causing an infinite loop. An authenticated user with INSERT privileges on any table can exploit this by sending a crafted Batch Parameter Block, leading to a server hang.
Users can upgrade to Firebird versions 5.0.4, 4.0.7, or 3.0.14 to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Apr 20, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/FirebirdSQL/firebird/releases/tag/v3.0.14 | [email protected] | Release Notes |
| https://github.com/FirebirdSQL/firebird/releases/tag/v4.0.7 | [email protected] | Release Notes |
| https://github.com/FirebirdSQL/firebird/releases/tag/v5.0.4 | [email protected] | Release Notes |
| https://github.com/FirebirdSQL/firebird/security/advisories/GHSA-7cq5-994r-jhrf | [email protected] | ExploitVendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-190 | Integer Overflow or Wraparound | [email protected] |
| CWE-835 | Loop with Unreachable Exit Condition ('Infinite Loop') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| firebirdsql firebird | < 3.0.14 >= 4.0.0, < 4.0.7 >= 5.0.0, < 5.0.4 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 24, 2026 | Initial Analysis | [email protected] |
| Apr 17, 2026 | New CVE Received | [email protected] |