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CWE

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CVE-2026-28214

Published: Apr 17, 2026

Modified: Apr 20, 2026

PUBLISHED

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.

Vendor	Product	Versions
FirebirdSQL	firebird	affected `>= 3.0.0, < 3.0.14` affected `>= 4.0.0, < 4.0.7` affected `>= 5.0.0, < 5.0.4`

Weaknesses (CWE)

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

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